Sahih Muslim 167
صحيح مسلم#167SahihA similar hadith has been reported on the authority of Anas (with another chain of transmitters) with the exception of these words:that he again becomes a Jew or a Christian
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: 1:74