The Prophet ﷺ said: The price paid for a dog, the price given to a soothsayer, and the hire paid to a prostitute are not lawful. (Using translation from Abū Dāʾūd 3484)
قَالَ النَّبِيُّ ﷺ «لَا يَحِلُّ ثَمَنُ الْكَلْبِ وَلَا حُلْوَانُ الْكَاهِنِ وَلَا مَهْرُ الْبَغِيِّ»