Sunan Abi Dawud 1534
سنن أبي داود#1534SahihAbu Al-Darda' said:I heard the Messenger of Allah (ﷺ) say: When a Muslim supplicates for his absent brother the angels say: Amin, and may you receive the like
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 Muslim (2732)
In-book reference: 8:119