Aisha reported: The Prophet, peace and blessings be upon him, would seek spiritual retreat in the mosque during the last ten nights of Ramadan, until Allah Almighty caused him to pass away. His wives continued to perform the retreat after him.
Source: Ṣaḥīḥ al-Bukhārī 2026, Ṣaḥīḥ Muslim 1172
Grade: Muttafaqun Alayhi (authenticity agreed upon) according to Al-Bukhari and Muslim
Al-Shafi’i, may Allah have mercy on him, said, “Whoever desires to follow the example of the Prophet in practicing spiritual retreat in the mosque during the last ten nights of Ramadan, he should enter the mosque before the setting of the sun on the twenty-first night.”
Source: al-Majmū’ Sharḥ al-Muhadhdhab 6/475
عَنْ عَائِشَةَ رَضِيَ اللَّهُ عَنْهَا أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ كَانَ يَعْتَكِفُ الْعَشْرَ الْأَوَاخِرَ مِنْ رَمَضَانَ حَتَّى تَوَفَّاهُ اللَّهُ عَزَّ وَجَلَّ ثُمَّ اعْتَكَفَ أَزْوَاجُهُ مِنْ بَعْدِهِ
2026 صحيح البخاري كتاب الاعتكاف باب الاعتكاف في العشر الأواخر
1172 صحيح مسلم كتاب الاعتكاف باب اعتكاف العشر الأواخر من رمضان
قَالَ الشَّافِعِيُّ رحمه الله وَمَنْ أَرَادَ الِاقْتِدَاءَ بِالنَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فِي الِاعْتِكَافِ فِي الْعَشْرِ الْأَوَاخِرِ مِنْ رَمَضَانَ فَيَنْبَغِي أَنْ يَدْخُلَ الْمَسْجِدَ قَبْلَ غُرُوبِ الشَّمْسِ لَيْلَةَ الْحَادِي وَالْعِشْرِينَ مِنْهُ
6/501 المجموع شرح المهذب كتاب الاعتكاف حكم الاعتكاف