Sunan Abi Dawud 3932
سنن أبي داود#3932HasanNarrated Umm Salamah, Ummul Mu'minin: Safinah said: I was a slave of Umm Salamah, and she said: I shall emancipate you, but I stipulate that you must serve the Messenger of Allah (ﷺ) as long as you live. I said: Even if you do not make a stipulation, I shall not leave the Messenger of Allah (ﷺ). She then emancipated me and made the stipulation with me
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniHasan
Muhammad Muhyi Al-Din Abdul HamidHasan
Shuaib Al ArnautHasan
Zubair Ali ZaiIsnaad Hasan
In-book reference: 31:7