Sahih Muslim 401
صحيح مسلم#401SahihAbu Dharr reported:I entered the mosque and the Messenger of Allah (ﷺ) was sitting there. When the sun disappeared (from the sight) he said: O Abu Dharr! Do you know where it goes? He (the narrator) said: Allah and His Apostle know best. He (the Holy Prophet) said. Verily it goes and begs permission, for prostration (to Allah) and the permission is granted to it. Once it would be said: Return to the place whence you came, and then it would rise from its setting place. Then he, after the recitation of 'Abdullah recited it: And that is its appointed term
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: 1:306