Sahih Al Bukhari Hadith Number 2033

Narrated `Amra: Aisha said, “the Prophet (peace be upon him) used to practice I`tikaf in the last ten days of Ramadan and I used to pitch a tent for him, and after offering the morning prayer, he used to enter the tent.” Hafsa asked the permission of `Aisha to pitch a tent for her and she allowed her and she pitched her tent. When Zainab bint Jahsh saw it, she pitched another tent. In the morning the Prophet (peace be upon him) noticed the tents. He said, ‘What is this?” He was told of the whole situation. Then the Prophet (peace be upon him) said, “Do you think that they intended to do righteousness by doing this?” He therefore abandoned the I`tikaf in that month and practiced I`tikaf for ten days in the month of Shawwal.”