Sahih Muslim 3448
صحيح مسلم#3448SahihUthman b. 'Affan reported that Allah's Messenger (ﷺ) had said:A Muhrim should neither marry himself, nor should he be got married to anyone, nor should he make the proposal of marriage
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: 16:51