Sunan Abi Dawud 2940
سنن أبي داود#2940SahihNarrated Ibn 'Umar:We used to take the oath of allegiance to the Prophet (ﷺ) to hear and obey, and he would tell: In What I am able
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 (2702) Sahih Muslim (1867)
In-book reference: 20:13