Ziyad related to me from Malik from Ibn Shihab from Amra bint Abdar-Rahman from A'isha that the Messenger of Allah, may Allah bless himand grant him peace, once wanted to do itikaf, and when he went off tothe place where he wanted to do itikaf he found some tents there,which were A'isha's tent, Hafsa's tent, and Zaynab's tent. When he sawthem he asked about them and someone told him that they were the tentsof A'isha, Hafsa and Zaynab. The Messenger of Allah, may Allah blesshim and grant him peace, said, "Do you think them devout?" Then heleft, and did not do itikaf until Shawwal, when he then did it for tendays.
USC-MSA web (English) reference: Book 19, Hadith 7
Arabic reference: Book 19, Hadith 698