The price of a dog is evil, the earning of a prostitute is evil and the earning of a cupper is evil.
Sahih Muslim Book 22, Hadith 51
← Previous Hadith 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.

Sahih Muslim Book 22, Hadith 50 Next Hadith → A hadith like this has been narrated on the authority of Rafi' b. Khadij through another chain of transmitters.

Sahih Muslim Book 22, Hadith 52