Sahih Muslim 2288
صحيح مسلم#2288SahihIbn 'Umar reported that the Messenger of Allah (ﷺ) ordered that the Sadaqat-ul-Fitr should be paid before the people go out for prayer
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: 12:26