Sahih Muslim 2599
صحيح مسلم#2599SahihHumaid b. 'Abd al-Rahman reported that Abu Huraira had narrated to him that the Messenger of Allah (ﷺ) commanded the person (who) broke the fast in Ramadan to free a slave or observe fasts for two (consecutive) months or feed sixty poor persons
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih Muslim is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 13:105