"Allah’s Messenger (Allah bless him and give him peace) spent one whole night reciting a verse from the Qur’an.” Commentary: The aayah is the last aayah of Surah Maa-idah:

In tu-adh-dhib-hum fa-innahum 'ibaaduk. Wa in tagh-fir lahum fa-innaka antal azizul hakim.
Translation: "If Thou punish them, lo! they are Thy slaves, and if Thou forgive them, (lo! the are Thy slaves).Lo! Thou, only Thou, art Mighty, the wise".Surah Maa-idah, 118.

The Being that possesses great power, if He wills, He may forgive the criminal. The One that is all Wise, there is Wisdom and benefit in every act of His. The reason for Sayyidina Rasulullah Sallallahu 'Alayhi Wasallam reciting this aayah while standing and also in the ruku and sajdah, and repeating it many times, is to bring to mind the two attributes of Allah, namely the attributes of justice and forgiveness. The whole scene on the day of qiyaamah will be of these two things. It is stated that Imaam Aa'zam Abu Hanifah RA. also recited the following aayah the whole night:

Wamtaazul yauma ayyuhal mujrimun.
Translation: "But avaunt ye, O ye guilty, this day!" Surah Yaseen, 58.

In this aayah too the scene of qiyaamah is portrayed. That today the sinners should separate and distinguish themselves. What a severe and nerve-chilling command this is. Today they are together with the pious and holy people and benefiting from the barakaat (blessings) they receive, but at this moment the sinners will be separated from them. May the Most Merciful Allah with His Grace keep those pious souls under His shadow, otherwise it is really a time for great trials.

Lā ilāha illallāhu waḥdahu lā sharīka lah, lahu ‘l-mulku walahu ‘l-ḥamd, wa huwa `alā kulli shay'in qadīr. None has the right to be worshipped but Allah alone, Who has no partner. His is the dominion and His is the praise and He is Able to do all things. (Recite ten times 1 in Arabic or one time to ward off laziness.) 2 Reference: 1Allah will write ten Hasanaat (rewards) for whoever recites this ten times in the morning, and forgive him ten misdeeds and give him the reward of freeing ten slaves and protect him from Satan. Whoever recites this ten times in the evening will get this same reward. An-Nasa'i, 'Amalul-Yawm wal-Laylah (no. 24). Its chain of transmission is sound (Sahih). Albani 1/272. Abu Hurayrah «fe narrated that the Prophet j§ said: "Allah will write one hundred Hasanat for whoever says There is no God but Allah alone, He has no partner. To Allah is possession of everything, and to Him all praise is. He is Capable of all things' ten times in the morning, and forgive him one hundred misdeeds. He will have the reward of freeing a slave and will be protected from Satan throughout the day unto dusk. Whoever says it in the evening will have the same reward." Ahmad 8/704, 16/293. Its chain of transmission is good (Hasan), Ibn Baz, p. 44. 2 Whoever recites this in the morning, will have the reward of freeing a slave from the Children of Isma'il. Ten Hasanaat (rewards) will be written for him, and he will be forgiven ten misdeeds, raised up ten degrees, and be protected from Satan until evening. Whoever says it in the evening will have the same reward until morning. Abu Dawud 4/319, 3/957, Ahmad 4/ 60, Ibn Majah 2/331, Ibn Al-Qayyim Zadul-Ma'ad 2/388. Its chain of transmission is sound (Sahih). Al-Albani 1/270.

“Allah’s Messenger (Allah bless him and give him peace) lost consciousness in his illness, then he regained consciousness and said: ‘Has the ritual prayer arrived?’ They said: ‘Yes,’ so he said: ‘Command Bilal to give the call to prayer, and command Abu Bakr to lead the people in prayer.’ Then he lost consciousness, and when he recovered, he said: ‘Has the ritual prayer arrived?’ They said: ‘Yes,’ so he said: ‘Command Bilal to give the call to prayer, and command Abu Bakr to lead the people in prayer.’ 'A'isha then said: ‘My father is a melancholy man. If he is given that responsibility, he will weep and lose command of himself. SO if only you would appoint someone else!' He [Salim] said: “Then he lost consciousness and recovered, so he said: ‘Command Bilal to give the call to prayer, and command Abu Bakr to lead the people in prayer, for you are the female companions of Yusuf!’ Bilal was therefore commanded, so he gave the call to prayer, and Abu Bakr was commanded, so he led the people in prayer. Then Allah’s Messenger (Allah bless him and give him peace) felt light in the head, so he said: ‘Find me someone I can lean on!’ Barira and another man therefore came to him, so he leaned on them. When Abu Bakr saw him, the man was about to withdraw, but he signaled for him to stay in his place until Abu Bakr completed his ritual prayer. Then Allah’s Messenger died (Allah bless him and give him peace), so 'Umar said: ‘If I hear anyone mention that Allah’s Messenger (Allah bless him and give him peace) has died, I will strike him with this sword of mine!”’ He [Salim] said: “The people were unlettered folk among whom there had never come a prophet before, so they held their tongues. But then they said: ‘O Salim, go to the Companion of Allah’s Messenger (Allah bless him and give him peace) and summon him.’ So I went to see Abu Bakr, in the mosque. I came to him weeping and perplexed, so when he saw me, he said: ‘Has Allah’s Messenger died (Allah bless him and give him peace)?’ I replied: 'Umar says: “If anyone mentions that Allah’s Messenger (Allah bless him and give him peace) has died, I will strike him with this sword of mine!” He then said to me: ‘Go outside,’ so I went outside with him. Then he came and found the people in the presence of Allah’s Messenger (Allah bless him and give him peace). “He therefore said: ‘O people, get out of my way,’ so they got out of his way. Then he leaned over him and touched him, saying: “You will surely die, and they will surely die." [inna-ka mayyitun wa inna-hum mayyitun].” (Al-Qur'an.39:3O). Then they said: ‘O Companion of Allah’s Messenger (Allah bless him and give him peace), should the funeral prayer be performed for Allah’s Messenger?’ When he said: ‘Yes,’ they asked: And how?’ He said: A group will enter, proclaim the Supreme Greatness of Allah, perform the ritual prayer and offer supplication. Then they will go out, so that other people may enter.’ They said: ‘O Companion of Allah’s Messenger (Allah bless him and give him peace), should Allah’s Messenger (Allah bless him and give him peace) be buried?’ When he said: ‘Yes,’ they asked: ‘Where?’ He said: ‘In the place in which Allah took his spirit, for Allah would not take his spirit in a place that was not good,’ and they knew that he had spoken the truth.’ Then he gave instructions for the sons of his father to bathe him, and the Emigrants [al-Muhajirun] assembled, consulting with one another. They said: ‘Take us to our brethren among the Helpers [al-Ansar], so that we may include them with us in this business.' The Helpers then said: ‘There should be a commander among us and a commander among you,’ so 'Umar ibn al-Khattab said: ‘Who has the like of these three [excellent merits of Abu Bakr]? [In the words of the Qur’an]: “The second of the two; when the two of them were in the cave, when he said to his companion: ‘Do not grieve. Allah is with us [thaniya’thnaini idh huma fi’l-ghari idh yaqulu li-sahibi-hi la tahzan inna’llaha ma'a-na].’” (Al-Qur'an.9:4O). Who are the two of them?’ Then he extended his hand, so they pledged allegiance to him, and the people paid him a beautiful homage.”