Sahih Muslim Book 10, Hadith Number 3785.

Chapter : The price of a dog, the sweets of a kahin, the earnings of a prostitute and the selling of a cat are all forbidden.

Abu Huraira (Allah be pleased with him) reported Allah’s Apostle (may peace be upon him) as saying: When a man becomes insolvent (and the other) man (the seller) finds his commodity intact with him, he is more entitled to get it (than anyone else)