Muwatta Imam Malik Book of Business Transactions, Hadith 68

Yahya related to me from Malik from Ibn Shihab from Abu Bakr ibn Abd ar-Rahman ibn al-Harith ibn Hisham from Abu Masud al-Ansari that the Messenger of Allah ﷺ forbade the sale price of a dog, the earnings of a prostitute and the earnings of a fortune teller.
By the earnings of a prostitute he meant what a woman was given for fornication. The earnings of a fortune teller were what he was given to tell a fortune.
Malik said, "I disapprove of the price of a dog, whether it is a hunting dog or otherwise because the Messenger of Allah ﷺ forbade the price of a dog."

حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنِ ابْنِ شِهَابٍ، عَنْ أَبِي بَكْرِ بْنِ عَبْدِ الرَّحْمَنِ بْنِ الْحَارِثِ بْنِ هِشَامٍ، عَنْ أَبِي مَسْعُودٍ الأَنْصَارِيِّ، أَنَّ رَسُولَ اللَّهِ ﷺ نَهَى عَنْ ثَمَنِ الْكَلْبِ وَمَهْرِ الْبَغِيِّ وَحُلْوَانِ الْكَاهِنِ . يَعْنِي بِمَهْرِ الْبَغِيِّ مَا تُعْطَاهُ الْمَرْأَةُ عَلَى الزِّنَا وَحُلْوَانُ الْكَاهِنِ رَشْوَتُهُ وَمَا يُعْطَى عَلَى أَنْ يَتَكَهَّنَ .