Sahih Muslim 4253
صحيح مسلم#4253SahihUqba. b. Amir reported Allah's Messenger (ﷺ) as saying:The expiation of the (breach of) a vow is the same as that of the (breach of an oath)
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: 26:18