بُلُوغُ الْمَرَامِ
Bulugh al-Maram 784
Business Transactions
وَعَنْ أَبِي مَسْعُودٍ - رضى الله عنه - { أَنَّ رَسُولَ اَللَّهِ - صلى الله عليه وسلم -نَهَى عَنْ ثَمَنِ اَلْكَلْبِ, وَمَهْرِ الْبَغِيِّ, وَحُلْوَانِ اَلْكَاهِنِ } مُتَّفَقٌ عَلَيْهِ [1] .
Narrated Abu Mas'ud al-Ansari (RA): Allah's Messenger (ﷺ) prohibited the money paid for a dog, the payment of a prostitute, and the payment given to a soothsayer." [Agreed upon].
Sunnah.com reference: Book 7, Hadith 4