Sunan Abi Dawud 442
سنن أبي داود#442SahihAnas b. Malik reported the Prophet (ﷺ) as saying:If any one forgets a prayer or oversleeps, he should observe it when he remembers it ; there is no expiation for it except that
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 (597) Sahih Muslim (684)
In-book reference: 2:52