Musannaf Ibn Abi Shayba 13:949

Abu Bakr narrated to us, he said: Waki’ narrated to us, from Abu Bakr, from Ibn Abi Layla, from ‘Ata, from Abu Hurayrah, who said: The Messenger of Allah (may Allah bless him and grant him peace) forbade the earnings of a prostitute, the stud fee of a stallion, the earnings of a cupper, and the price of a dog.