Sunan an-Nasa'i 2290
سنن النسائي#2290SahihIt was narrated that Ibn 'Abbas said:"The Messenger of Allah went out to Makkah, and he fasted until he came to 'Usfan. Then he called for a cup and drank." (One of the narrators) Shubah said: "(That was) in Ramadan. Ibn 'Abbas used to say: 'Whoever wants to fast, may fast, and whoever wants to break may break his fast
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 ZaiSahih
In-book reference: 22:201