Sahih Muslim 4011
صحيح مسلم#4011SahihRafi b. Khadij (Allah be pleased with him) reported:I heard Allah's Apostle (ﷺ) as saying: The worst earning is the earning of a prostitute, the price of a dog and the earning of a cupper
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: 22:50