It is narrated from Sayyiduna Abu Mas'ud al-Ansari (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) forbade "the price of a dog, the earnings of a prostitute and the fee of a soothsayer."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 1186