Sahih Muslim | Book 15 | Chapter 7

Narrated by Ibn 'Umar
Ibn 'Umar reported that Umar (b. Khattab) said: Messenger of Allah, I had taken a vow during the days of Ignorance (Jahiliyya) that I would observe I'tikaf for a night in the Sacred Mosque. He (the Holy Prophet) said: Fulfil your vow.

Narrated by Ibn Umar
This hadith is transmitted on the authority of Ibn Umar with a slight variation of words.
Narrated by 'Abdullah b. 'Umar
'Abdullah b. 'Umar reported that 'Umar b. Khattab asked the Messenger of Allah (may peace be upon him) as he was at ji'rana (a town near Mecca) on his way back from Ta'if: Messenger of Allah, I had taken a vow during the days of Ignorance that I would observe I'tikaf for one day in the Sacred Mosque. So what is your opinion? He said: Go and observe I'tikaf for a day. And Allah's Messenger (may peace be upon him) gave him a slave girl out of the one-fifth (of the spoils of war meant for the Holy Prophet). And when Allah's Messenger (may peace be upon him) set the war prisoners free. 'Umar b. Khattab heard their voice as they were saying: Allah's Messenger (may peace be upon him) has set as free. He (Hadrat 'Umar) said: What is this? They said: Allah's Messenger (may peace

be upon him) has set free the prisoners of war (which had fallen to the lot of people). Thereupon he (Hadrat 'Umar) said: Abdullah, go to that slave-girl and set her free.

Narrated by lbn 'Umar
lbn 'Umar reported: When Allah's Apostle (may peace be upon him) came back from the Battle of Hunain, Umar asked Allah's Messenger (may peace be upon him) about the vow he had taken during the days of Ignorance that he would observe I'tikaf for a day. The rest of the hadith is the same.

Narrated by Nafi'
Nafi' reported: A mention of Allah's Messenger (may peace be upon him) observing 'Umra from ja'rina was made before Ibn 'Umar. He said: He did not enter into the state of Ihram from that (place), and Umar had taken a vow of observing I'tikaf for a night during the days of Ignorance. The rest of the hadith is the same.

Narrated by Ibn Umar
This hadith has been transmitted on the authority of Ibn Umar through another chain of transmitters but with a slight variation of words.