Sahih Muslim 3274
صحيح مسلم#3274SahihIbn Juraij narrated this hadith with the same chain of transmitters, but he made no mention of it:" No person (man) should be alone with a woman except when there is a Mahram with her
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: 15:478