"Also (forbidden are) women already married, except those whom your right hands possess. Thus has Allah ordained for you. All others are lawful, provided you seek them from your property, desiring chastity, not fornication. So with those among them whom you have enjoyed, give them their required due, but if you agree mutually after the requirement (has been determined), there is no sin on you. Surely, Allah is Ever All-Knowing, All-Wise." - Quran 4:24 (read more)

"Narrated 'Abdullah bin 'Umar : The Jew brought to the Prophet a man and a woman from amongst them who have committed (adultery) illegal sexual intercourse. He ordered both of them to be stoned (to death), near the place of offering the funeral prayers beside the mosque." - Sahih Bukhari 7:62:64 (read more)

"It is also incumbent upon Muslims that they should not accept from them [Jews] victuals with which they had come into contact, such as distillates, which cannot be purified. If something can be purified, such as clothes, if they are dry, they can be accepted, they are clean...It would also be better if the ruler of the Muslims would establish that all infidels could not move out of their homes on days when it rains or snows because they would make Muslims impure." - Muhammad Baqir Majlesi