Sahih al-Bukhari Book 33, Hadith 8
Aisha said, "the Prophet (ﷺ) 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 (ﷺ) noticed the tents. He said,
'What is this?" He was told of the whole situation. Then the Prophet (ﷺ) 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."
`Umar asked the Prophet (ﷺ) "I vowed in the Pre-Islamic period of ignorance to stay in I`tikaf for one night in Al-Masjid al-Haram." The Prophet (ﷺ) said to him, "Fulfill your vow."
The Prophet (ﷺ) intended to practice I`tikaf and when he reached the place where he intended to perform I`tikaf, 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 I`tikaf (in Ramadan) but performed it in the month of Shawwal for ten days.