Sunan Abi Dawud 2465
سنن أبي داود#2465SahihIbn 'Umar said:The Prophet (ﷺ) used to observe I'tikaf during the last ten days of Ramadan. Nafi' said: 'Abd Allah (b. 'Umar) showed me the place in the mosque where Messenger of Allah (ﷺ) used to observe I'tikaf
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih
Muhammad Muhyi Al-Din Abdul HamidSahih
Shuaib Al ArnautSahih
Zubair Ali ZaiSahih Bukhari (2025) Sahih Muslim (1171)
In-book reference: 14:153