Sahih Bukhari Volume 003, Book 033, Hadith Number 250.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 33. Retiring To a Masjid for Remembrance Of Allah (I'tikaf)
Narated By 'Aisha : The Prophet intended to practice Itikaf and when he reached the place where he intended to perform Itikaf, he saw some tents, the tents of 'Aisha, Hafsa and Zainab. So, he said, "Do you consider that they intended to do righteousness by doing this?" And then he went away and did not perform Itikaf (in Ramadan) but performed it in the month of Shawwal for ten days.