وَعَنْهَا أَيْضًا قَالَتْ: إِنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ كَانَ يَعْتَكِفُ الْعَشْرَ الْأَوَاخِرَ مِنْ رَمَضَانَ حَتَّى تَوَفَّاهُ اللَّهُ، ثُمَّ اعْتَكَفَ أَزْوَاجُهُ مِنْ بَعْدِهِ
Lady Aisha (may Allah be pleased with her) narrated that the Noble Prophet (peace and blessings be upon him) used to observe i'tikaf during the last ten days of Ramadan, until Allah Almighty caused him to pass away. Then, after him, his wives also observed i'tikaf.