Sunan Abi Dawud 2931
سنن أبي داود#2931SahihNarrated Anas:The Prophet (ﷺ) appointed Ubn Umm Makthum as a governor of Medina (in his absence) twice
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
In-book reference: 20:4