Sahih Muslim 5871
صحيح مسلم#5871SahihAbu Huraira reported from Allah's Messenger (ﷺ) various ahadith, one of which is this that he said:None of you should use the word al-karm for 'Inab, for karm (worthy of respect) is a Muslim person
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: 40:10