Sunan Abi Dawud 1286
سنن أبي داود#1286SahihAbu al-Aswad al-Dailani said:While we were present with Abu Dharr, he said: In the morning, alms are due for him, ever fast is alms, every pilgrimage is alms, every utterance of "Glory to be Allah" is alms, every utterance of "Allah is most great" is alms, every utterance of "Praise be to Allah" is alms. The Messenger of Allah (ﷺ) recounted all such good works. He then said: Two rak'ahs which one prays in the Duha serve instead of that
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 (720)
In-book reference: 5:37