Ubayy b. Ka'b reported that he was sitting in a mosque that a person entered it and he observed prayer, and made recitation, the rest of the hadith is the same.

Jabir reported that Allah's Messenger (may peace be upon him) sent a phystian to Ubayy b. Ka'b. He cut the vein and then cauterised it.

Ka'b ibn Malik said to AbuLubabah; or someone else whom Allah wished; or to the Prophet (saws): To make my repentance complete I should depart from the house of my people in which I fell into sin, and that I should divest myself of all my property as sadaqah (alms). He said: A third (of your property) will be sufficient for you.

Abu Dawud said: This tradition has been narrated by Yunus from Ibn Shihab from some of the children of al-Sa'ib son of Abu Lubabah. A similar tradition has also been transmitted by al-Zabidi from al-Zuhri from Husain b. al-Sa'ib son of Abu Lubabah.

The Prophet (saws) sent a physician to Ubayy (ibn Ka'b), and he cut his vein.

Ibn 'Umar reported that Allah's Messenger (may peace be upon him) happened to pass by Ibn Sayyad along with his Companions including 'Umar b. Khattab as he was playing with children near the battlement of Bani Maghala and he was also a child by that time. The rest of the hadith is the same as narrated by Ibn Umar (in which there is a mention of) setting out of Allah's Apostle (may peace be upon him) along with Ubayy b. Ka'b towards the date-palm trees.

On the authority of his father: Umm Mubashshir said to the Prophet (saws) during the sickness of which he died: What do you think about your illness, Messenger of Allah (saws)? I do not think about the illness of my son except the poisoned sheep of which he had eaten with you at Khaybar. The Prophet (saws) said: And I do not think about my illness except that. This is the time when it cut off my aorta.

Abu Dawud said: Sometime 'Abd al-Razzaq transmitted this tradition, omitting the link of the Companion, from Ma'mar, from al-Zuhri, from the Prophet (saws), and sometimes he transmitted it from al-Zuhri from 'Abd al-Rahman b. Ka'b b. Malik, 'Abd al-Rahman mentioned that Ma'mar sometimes transmitted the tradition in a mursal form (omitting the link of the Companion), and they recorded it. And all this is correct with us. 'Abd al-Razzaq said: When Ibn al-Mubarak came to Ma'mar, he transmitted the traditions in a musnad form (with a perfect chain) which he transmitted as mauquf traditions (statements of the Companions and not of the Prophet).

It was rarely that the Messenger of Allah (saws) set out on a journey on any day but on a Thursday.

'Abdur Rahman bin 'Abdul Qari said,

"I went out in the company of 'Umar bin Al-Khattab one night in Ramadan to the mosque and found the people praying in different groups. A man praying alone or a man praying with a little group behind him. So, 'Umar said, 'In my opinion I would better collect these (people) under the leadership of one Qari (Reciter) (i.e. let them pray in congregation!)'. So, he made up his mind to congregate them behind Ubai bin Ka'b. Then on another night I went again in his company and the people were praying behind their reciter. On that, 'Umar remarked, 'What an excellent Bid'a (i.e. innovation in religion) this is; but the prayer which they do not perform, but sleep at its time is better than the one they are offering.' He meant the prayer in the last part of the night. (In those days) people used to pray in the early part of the night."

The Messenger of Allah (saws) came upon him (during their stay) at al-Hudaybiyyah. He then narrated the rest of the tradition. This version adds: "He asked: Do you have a sacrificial animal? He replied: No. He then said: Fast three days or give three sa's of dates to six poor people, giving one sa' to every two persons."

When the Messenger of Allah (saws) offered salutation in the witr prayer, he said: Glorify be to the king most holy.

Samurah ibn Jundub and Imran ibn Husayn had a discussion (about the periods of silence in prayer). Samurah then said that he remembered two periods of silence from the Messenger of Allah (saws); one when he uttered the takbir and the other when he finished reciting: "Not of those with whom Thou art angry, nor of those who go astray" (i.7).

Samurah remembered that, but Imran ibn Husayn rejected it.

Then they wrote about it to Ubayy ibn Ka'b. He wrote a letter to them and gave a reply to them that Samurah remembered correctly.

Ka'b b. Malik reported on the authority of his father that the similitude of a believer is that of a standing crop. The wind sometimes shakes it and sometimes raises it up and then it comes to its destined end. And the similitude of a hypocrite is that of a cypress tree which is not affected by anything but is uprooted once for all.

Ubayy ibn Ka'b) said: The Prophet (saws) read the verse: "Say: In the bounty of Allah and in His mercy--in that let you rejoice: that is better than the wealth you hoard."