The Prophet of Allah ﷺ said, "The worst of earnings are the price of a dog, the earnings of a cupper, and the wages of a prostitute."
حدثنا يحيى بن سعيد حدثنا محمد بن يوسف قال سمعت السائب بن يزيد بن أخت النمر
أن نبي الله ﷺ قال شر الكسب ثمن الكلب وكسب الحجام ومهر البغي
Its isnad is sahih. Muhammad bin Yusuf bin Abdullah Kindi is known as Ibn Ukht Namir, and he is trustworthy and reliable. Saaib bin Yazid is also known as Ibn Ukht Namir, and he is a minor companion. The hadith has already appeared at 15756.