Imam an-Nawawi (d. 676 AH)
I'tikaf (Seclusion in the Mosque) in the Month of Ramadan
Ibn `Umar (May Allah be pleased with them) reported: The Messenger of Allah (ﷺ) used to observe I`tikaf in the last ten days of Ramadan. [Al-Bukhari and Muslim].
I'tikaf (Seclusion in the Mosque) in the Month of Ramadan
'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].
I'tikaf (Seclusion in the Mosque) in the Month of Ramadan
Abu Hurairah (May Allah be pleased with him) reported: The Prophet (ﷺ) used to observe I'tikaf every year (during Ramadan) for ten days; in the year in which he passed away, he observed I'tikaf for twenty days. [Al-Bukhari].