Sunan Abi Dawud 424
سنن أبي داود#424SahihRafi' b. Khadij reported the Messenger of Allah (ﷺ) as saying:Offer Fajr prayer at dawn, for it is most productive of rewards to you or most productive of reward
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniHasan Sahih
Muhammad Muhyi Al-Din Abdul HamidHasan Sahih
Shuaib Al ArnautHasan
Zubair Ali ZaiSahih
In-book reference: 2:34