Sahih Muslim 1938
صحيح مسلم#1938SahihMukhtar b. Fulful said:I asked Anas b. Malik about the voluntary prayers after the afternoon prayer, and he replied: 'Umar struck hit hands on prayer observed after the 'Asr prayer and we used to observe two rak'ahs after the sun set before the evening prayer during the time of the Messenger of Allah (ﷺ). I said to him: Did the Messenger of Allah (ﷺ) observe them? He said: He saw us observing them, but he neither commanded us nor forbade us to do so
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: 6:366