Sahih Muslim
The Book Pertaining to the Merits of the Companions (Allah Be Pleased With Them) of the Holy Prophet (May Peace Be Upon Him) (Kitab Al-Fadail Al-Sahabah)
Book Number: 031 / Hadith Number: 5941
'Abdullah b. Zubair reported: When it was the Day of the Battle of the Ditch I and 'Umar b. Salama were in the fort in which there were women, i. e. the wives of Allah's Apostle (may peace be upon him) ; the rest of the hadith is the same.