Sunan Abi Dawud 1684
سنن أبي داود#1684SahihAbu Musa reported The Messenger of Allah (ﷺ) as saying The faithful trustee who gives what he is commanded completely and in full with a good will, and delivers it to the one whom he was told to give it, is one of the two who gives sadaqah
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 (1438) Sahih Muslim (1023)
In-book reference: 9:129