The sunnah for one who is observing i'tikaf (in a mosque) is not to visit a patient, or to attend a funeral, or touch or embrace one's wife, or go out for anything but necessary purposes. There is no i'tikaf without fasting, and there is no i'tikaf except in a congregational mosque.

Once Allah's Apostle led us in prayer and then (after finishing it) ascended the pulpit and pointed with his hand towards the Qibla of the mosque and said, "While I was leading you in prayer, both Paradise and Hell were displayed in front of me in the direction of this wall. I had never seen a better thing (than Paradise) and a worse thing (than Hell) as I have seen today, I had never seen a better thing and a worse thing as I have seen today."

Yazid prayed along with the Messenger of Allah (saws) when he was a young boy. When he (the Prophet) had prayed there were two persons (sitting) in the corner of the mosque; they did not pray (along with the Prophet). He called for them. They were brought trembling (before him). He asked: What prevented you from praying along with us? They replied: We have already prayed in our houses. He said: Do not do so. If any of you prays in his house and finds that the imam has not prayed, he should pray along with him; and that will be a supererogatory prayer for him.

When the Messenger of Allah (saws) arrived from his hajj, he entered Medina, and made (his camel) kneel down at the gate of his mosque; and he entered it and offered two rak'ahs of prayer; he then returned to his home. Nafi' said: Ibn Umar also used to do so.

Yahya related to me from Malik from Abu'z Zubayr al-Makki that Abu Maiz al-Aslami Abdullah ibn Sufyan told him that once, when he was sitting with Abdullah ibn Umar, a woman came to ask him for an opinion. She said, "I set out intending to do tawaf of the House, but then, when I got to the gate of the Mosque, I started bleeding, so I went back until it had left me. Then I set out again, and then, when I got to the gate of the mosque, I started bleeding, so I went back until it had left me. Then I set off again, and then, when I got to the gate of the mosque, I started bleeding." Abdullah ibn Umar said, "That is only an impulse from Shaytan. Do ghusl, then bind your private parts with a cloth and do tawaf."

The Prophet saw sputum on (the wall of) the mosque in the direction of the Qibla and scraped it off with gravel. Then he forbade Spitting in front or on the right, but allowed it on one's left or under one's left foot.

Yahya related to me from Malik from Ibn Shihab from Urwa ibn az- Zubayr from A'isha, the wife of the Prophet, may Allah bless him and grant him peace, that the Messenger of Allah, may Allah bless him and grant him peace, prayed in the mosque one night and people prayed behind him. Then he prayed the next night and there were more people. Then they gathered on the third or fourth night and the Messenger of Allah, may Allah bless him and grant him peace, did not come out to them. In the morning, he said, "I saw what you were doing and the only thing that prevented me from coming out to you was that I feared that it would become obligatory (fard) for you." This happened in Ramadan.

Abu Maryam said: The man with the crippled hand was called Nafi` Dhu al-Thadyah (Nafi`, man of nipple). He had in his hand something like a female breast with a nipple at it ends like the nipple of the female breast. If had some hair on it like the whiskers of cat.

Abu Dawud said: He was known among the people by the name of Harqus.

When the deputation of Thaqif came to the Messenger of Allah (saws), he made them stay in the mosque, so that it might soften their hearts. They stipulated to him that they would not be called to participate in Jihad, to pay zakat and to offer prayer. The Messenger of Allah (saws) said: You may have the concession that you will not be called to participate in jihad and pay zakat, but there is no good in a religion which has no bowing (i.e. prayer).

I heard the Messenger of Allah (saws) say: Were it not hard on my ummah, I would order them to use the tooth-stick at the time of every prayer. AbuSalamah said: Zayd ibn Khalid used to attend the prayers in the mosque with his tooth-stick on his ear where a clerk carries a pen, and whenever he got up for prayer he used it.

While we were in the Mosque, the Prophet came out and said, "Let us go to the Jews" We went out till we reached Bait-ul-Midras. He said to them, "If you embrace Islam, you will be safe. You should know that the earth belongs to Allah and His Apostle, and I want to expel you from this land. So, if anyone amongst you owns some property, he is permitted to sell it, otherwise you should know that the Earth belongs to Allah and His Apostle."

The Prophet said, "Seven (people) will be shaded by Allah by His Shade on the Day of Resurrection when there will be no shade except His Shade. (They will be), a just ruler, a young man who has been brought up in the worship of Allah, a man who remembers Allah in seclusion and his eyes are then flooded with tears, a man whose heart is attached to mosques (offers his compulsory congregational prayers in the mosque), two men who love each other for Allah's Sake, a man who is called by a charming lady of noble birth to commit illegal sexual intercourse with her, and he says, 'I am afraid of Allah,' and (finally), a man who gives in charity so secretly that his left hand does not know what his right hand has given."

AbdurRahman ibn al-Akhnas said that when he was in the mosque, a man mentioned Ali (may Allah be pleased with him). So Sa'id ibn Zayd got up and said: I bear witness to the Messenger of Allah (saws) that I heard him say: Ten persons will go to Paradise: The Prophet (saws) will go to Paradise, AbuBakr will go to Paradise, Umar will go to Paradise, Uthman will go to Paradise, Ali will go to Paradise, Talhah will go to Paradise: az-Zubayr ibn al-Awwam will go to paradise, Sa'd ibn Malik will go to Paradise, and AbdurRahman ibn Awf will go to Paradise. If I wish, I can mention the tenth. The People asked: Who is he: So he kept silence. The again asked: Who is he: He replied: He is Sa'id ibn Zayd.

The Prophet (saws) came to the mosque of Banu AbdulAshhal. He prayed the sunset prayer there. When they finished the prayer, he saw them praying the supererogatory prayer after it. He said: This is the prayer to be offered in the houses.

The Prophet took a room made of date palm leaves mats in the mosque. Allah's Apostle prayed in it for a few nights till the people gathered (to pray the night prayer (Tarawih) (behind him.) Then on the 4th night the people did not hear his voice and they thought he had slept, so some of them started humming in order that he might come out. The Prophet then said, "You continued doing what I saw you doing till I was afraid that this (Tarawih prayer) might be enjoined on you, and if it were enjoined on you, you would not continue performing it. Therefore, O people! Perform your prayers at your homes, for the best prayer of a person is what is performed at his home except the compulsory congregational) prayer." (See Hadith No. 229,Vol. 3) (See Hadith No. 134, Vol. 8)

Abu Sa`id who participated in twelve Ghazawat with the Prophet said, "I heard four things from Allah's Apostle (or I narrate them from the Prophet ) which won my admiration and appreciation. They are: -1. "No lady should travel without her husband or without a Dhu-Mahram for a two-days' journey. -2. No fasting is permissible on two days of `Id-ul-Fitr, and `Id-al-Adha. -3. No prayer (may be offered) after two prayers: after the `Asr prayer till the sun set and after the morning prayer till the sun rises. -4. Not to travel (for visiting) except for three mosques: Masjid-al-Haram (in Mecca), my Mosque (in Medina), and Masjid-al-Aqsa (in Jerusalem).

In the mosque l asked Ibn Abi Hadrad to pay the debts which he owed to me and our voices grew louder. Allah's Apostle heard that while he was in his house. So he came to us raising the curtain of his room and said, "O Ka`b!" I replied, "Labaik, O Allah's Apostle!" He said, "O Ka`b! reduce your debt to one half," gesturing with his hand. I said, "O Allah's Apostle! I have done so." Then Allah's Apostle said (to Ibn Abi Hadrad), "Get up and pay the debt to him."

One night Allah's Apostle offered the prayer in the Mosque and the people followed him. The next night he also offered the prayer and too many people gathered. On the third and the fourth nights more people gathered, but Allah's Apostle did not come out to them. In the morning he said, "I saw what you were doing and nothing but the fear that it (i.e. the prayer) might be enjoined on you, stopped me from coming to you." And that happened in the month of Ramadan.

Ka`b demanded his debt back from Ibn Abi Hadrad in the Mosque and their voices grew louder till Allah's Apostle heard them while he was in his house. He came out to them raising the curtain of his room and addressed Ka`b, "O Ka`b!" Ka`b replied, "Labaik, O Allah's Apostle." (He said to him), "Reduce your debt to one half," gesturing with his hand. Ka`b said, "I have done so, O Allah's Apostle!" On that the Prophet said to Ibn Abi Hadrad, "Get up and repay the debt, to him."

I entered the mosque while Allah's Apostle was sitting there. When the sun had set, the Prophet said, "O Abu Dharr! Do you know where this (sun) goes?" I said, "Allah and His Apostle know best." He said, "It goes and asks permission to prostrate, and it is allowed, and (one day) it, as if being ordered to return whence it came, then it will rise from the west." Then the Prophet recited, "That: "And the sun runs on its fixed course (for a term decreed)," (36.38) as it is recited by `Abdullah.

I heard `Uthman bin `Affan saying, when people argued too much about his intention to reconstruct the mosque of Allah's Apostle, "You have talked too much. I heard the Prophet saying, 'Whoever built a mosque, (Bukair thought that `Asim, another sub-narrator, added, "Intending Allah's Pleasure"), Allah would build for him a similar place in Paradise.' "

Allah's Apostle saw some expectoration on the wall of the mosque; he took gravel and scraped it off and said, "If anyone of you wanted to spit he should neither spit in front of him nor on his right but he could spit either on his left or under his left foot."

I sold a camel to the Prophet on one of the journeys. When we reached Medina, he ordered me to go to the Mosque and offer two rak`at. Then he weighed for me (the price of the camel in gold) and gave an extra amount over it. A part of it remained with me till it was taken by the army of Sham on the day of Harra."

Allah's Apostle said, "The congregational prayer of anyone amongst you is more than twenty (five or twenty seven) times in reward than his prayer in the market or in his house, for if he performs ablution completely and then goes to the mosque with the sole intention of performing the prayer, and nothing urges him to proceed to the mosque except the prayer, then, on every step which he takes towards the mosque, he will be raised one degree or one of his sins will be forgiven. The angels will keep on asking Allah's forgiveness and blessings for everyone of you so long as he keeps sitting at his praying place. The angels will say, 'O Allah, bless him! O Allah, be merciful to him!' as long as he does not do Hadath or a thing which gives trouble to the other." The Prophet further said, "One is regarded in prayer so long as one is waiting for the prayer."

Sa`d was wounded on the day of Khandaq (i.e. Trench) when a man from Quraish, called Hibban bin Al-`Araqa hit him (with an arrow). The man was Hibban bin Qais from (the tribe of) Bani Mais bin 'Amir bin Lu'ai who shot an arrow at Sa`d's medial arm vein (or main artery of the arm). The Prophet pitched a tent (for Sa`d) in the Mosque so that he might be near to the Prophet to visit. When the Prophet returned from the (battle) of Al-Khandaq (i.e. Trench) and laid down his arms and took a bath Gabriel came to him while he (i.e. Gabriel) was shaking the dust off his head, and said, "You have laid down the arms?" By Allah, I have not laid them down. Go out to them (to attack them)." The Prophet said, "Where?" Gabriel pointed towards Bani Quraiza. So Allah's Apostle went to them (i.e. Banu Quraiza) (i.e. besieged them). They then surrendered to the Prophet's judgment but he directed them to Sa`d to give his verdict concerning them. Sa`d said, "I give my judgment that their warriors should be killed, their women and children should be taken as captives, and their properties distributed." Narrated Hisham: My father informed me that `Aisha said, "Sa`d said, "O Allah! You know that there is nothing more beloved to me than to fight in Your Cause against those who disbelieved Your Apostle and turned him out (of Mecca). O Allah! I think you have put to an end the fight between us and them (i.e. Quraish infidels). And if there still remains any fight with the Quraish (infidels), then keep me alive till I fight against them for Your Sake. But if you have brought the war to an end, then let this wound burst and cause my death thereby.' So blood gushed from the wound. There was a tent in the Mosque belonging to Banu Ghifar who were surprised by the blood flowing towards them . They said, 'O people of the tent! What is this thing which is coming to us from your side?' Behold! Blood was flowing profusely out of Sa`d's wound. Sa`d then died because of that."

In the lifetime of Allah's Apostle the mosque was built of adobes, its roof of the leaves of date-palms and its pillars of the stems of date-palms. Abu Bakr did not alter it. `Umar expanded it on the same pattern as it was in the lifetime of Allah's Apostle by using adobes, leaves of date-palms and changing the pillars into wooden ones. `Uthman changed it by expanding it to a great extent and built its walls with engraved stones and lime and made its pillars of engraved stones and its roof of teak wood.

"Allah's Apostle in his fatal illness came out with a piece of cloth tied round his head and sat on the pulpit. After thanking and praising Allah he said, "There is no one who had done more favor to me with life and property than Abu Bakr bin Abi Quhafa. If I were to take a Khalil, I would certainly have taken Abu- Bakr but the Islamic brotherhood is superior. Close all the small doors in this mosque except that of Abu Bakr."

Allah's Apostle said, "The reward of the prayer offered by a person in congregation is twenty five times greater than that of the prayer offered in one's house or in the market (alone). And this is because if he performs ablution and does it perfectly and then proceeds to the mosque with the sole intention of praying, then for every step he takes towards the mosque, he is upgraded one degree in reward and his one sin is taken off (crossed out) from his accounts (of deeds). When he offers his prayer, the angels keep on asking Allah's Blessings and Allah's forgiveness for him as long as he is (staying) at his Musalla. They say, 'O Allah! Bestow Your blessings upon him, be Merciful and kind to him.' And one is regarded in prayer as long as one is waiting for the prayer."

I asked Abu Sa`id, and he was a friend of mine, (about the Night of Qadr) and he said, "We practiced I`tikaf (seclusion in the mosque) in the middle third of the month of Ramadan with the Prophet . In the morning of the 20th of Ramadan, the Prophet came and addressed us and said, 'I was informed of (the date of the Night of Qadr) but I was caused to forget it; so search for it in the odd nights of the last ten nights of the month of Ramadan. (In the dream) I saw myself prostrating in mud and water (as a sign). So, whoever was in I`tikaf with me should return to it with me (for another 10-day's period)', and we returned. At that time there was no sign of clouds in the sky but suddenly a cloud came and it rained till rainwater started leaking through the roof of the mosque which was made of date-palm leaf stalks. Then the prayer was established and I saw Allah's Apostle prostrating in mud and water and I saw the traces of mud on his forehead."