Sahih Bukhari Volume 3, Book 33, Hadith 2042

حَدَّثَنَا مُحَمَّدٌ، أَخْبَرَنَا مُحَمَّدُ بْنُ فُضَيْلِ بْنِ غَزْوَانَ، عَنْ يَحْيَى بْنِ سَعِيدٍ، عَنْ عَمْرَةَ بِنْتِ عَبْدِ الرَّحْمَنِ، عَنْ عَائِشَةَ ـ رضى الله عنها ـ قَالَتْ كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم يَعْتَكِفُ فِي كُلِّ رَمَضَانَ، وَإِذَا صَلَّى الْغَدَاةَ دَخَلَ مَكَانَهُ الَّذِي اعْتَكَفَ فِيهِ ـ قَالَ ـ فَاسْتَأْذَنَتْهُ عَائِشَةُ أَنْ تَعْتَكِفَ فَأَذِنَ لَهَا فَضَرَبَتْ فِيهِ قُبَّةً، فَسَمِعَتْ بِهَا حَفْصَةُ، فَضَرَبَتْ قُبَّةً، وَسَمِعَتْ زَيْنَبُ بِهَا، فَضَرَبَتْ قُبَّةً أُخْرَى، فَلَمَّا انْصَرَفَ رَسُولُ اللَّهِ صلى الله عليه وسلم مِنَ الْغَدِ أَبْصَرَ أَرْبَعَ قِبَابٍ، فَقَالَ ‏"‏ مَا هَذَا ‏"‏‏.‏ فَأُخْبِرَ خَبَرَهُنَّ، فَقَالَ ‏"‏ مَا حَمَلَهُنَّ عَلَى هَذَا آلْبِرُّ انْزِعُوهَا فَلاَ أَرَاهَا ‏"‏‏.‏ فَنُزِعَتْ، فَلَمْ يَعْتَكِفْ فِي رَمَضَانَ حَتَّى اعْتَكَفَ فِي آخِرِ الْعَشْرِ مِنْ شَوَّالٍ‏.‏

Narrated By 'Amra bint 'Abdur-Rahman from 'Aisha : Allah's Apostle used to practice Itikaf every year in the month of Ramadan. And after offering the morning prayer, he used to enter the place of his Itikaf. 'Aisha asked his permission to let her practice Itikaf and he allowed her, and so she pitched a tent in the mosque. When Hafsa heard of that, she also pitched a tent (for herself), and when Zainab heard of that, she too pitched another tent. When, in the morning, Allah's Apostle had finished the morning prayer, he saw four tents and asked, "What is this?" He was informed about it. He then said, "What made them do this? Is it righteousness? Remove the tents, for I do not want to see them." So, the tents were removed. The Prophet did not perform Itikaf that year in the month of Ramadan, but did it in the last ten days of Shawwal.