The Prophet (ﷺ) forbade the price paid for a dog, the hire paid to a prostitute, and the gift given to a soothsayer.
Sunan Abi Dawud Book 24, Hadith 13
← Previous Hadith The Messenger of Allah (ﷺ) forbade earnings of a slave-girl unless it is known from where it came.

Sunan Abi Dawud Book 24, Hadith 12 Next Hadith → The Messenger of Allah (ﷺ) forbade (taking hire for) a stallion's covering.

Sunan Abi Dawud Book 24, Hadith 14