Aba Mas'ud al-Ansari (RA) reported that Allah's Messenger (ﷺ) forbade the charging of price of the dog, and earnings of a prostitute and sweets offered to a kahin.
Rafi bin Khadij (RA) 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.
Rafi bin Khadij reported Allah'& Messenger (ﷺ) as saying: The price of a dog is evil, the earning of a prostitute is evil and the earning of a cupper is evil.