Sahih Muslim Book 31, Hadith Number 5941.
Chapter : The merits of Zubair and Talha (Allah be pleased with both of them).
‘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.