Hadith
Riyad as-Salihin #590
The Book of I'tikaf· كتاب الاعتكاف
riyad_as_salihin:590وعن عائشة رضي الله عنها أن النبي صلى الله عليه وسلم كان يعتكف العشر الأواخر من رمضان، حتى توفاه الله، تعالى ثم اعتكف أزواجه من بعده. ((متفق عليه))
The Prophet (ﷺ) used to engage himself in I'tikaf (seclusion for prayers) in the mosque during the last ten nights of Ramadan till he passed away; thereafter, his wives followed this practice after him..
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