Sunan Abi Dawud 5156
سنن أبي داود#5156SahihNarrated Ali ibn AbuTalib: The last words which the Messenger of Allah (ﷺ) spoke were: Prayer, prayer; fear Allah about those whom your right hands possess
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 Lighairihi
In-book reference: 43:384