عن ابن عمر رضي الله عنهما، قال‏:‏ كان رسول الله صلى الله عليه وسلم يعتكف العشر الأواخر من رمضان‏.‏ ‏(‏‏(‏متفق عليه‏)‏‏)‏

'Aishah (May Allah be pleased with her) reported

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.[Al- Bukhari and Muslim].