Sunan an-Nasa'i 2223
سنن النسائي#2223SahihIt was narrated that Abu Umamah said:"I said: 'O Messenger of Allah, tell me of an action (I should do).' He said: 'Take to fasting, for there is nothing equal to it
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiHasan
In-book reference: 22:134