Sahih Muslim 5375
صحيح مسلم#5375SahihIbn 'Umar reported Allah's Messenger (ﷺ) as saying:A believer eats in one intestine, whereas a non-believer eats in seven intestines
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: 36:249