Allah the Exalted has said: "O you who believe! Fear Allah and give up what remains due to you from usury, if you are indeed believers. But if you do not do it, then take notice of war from Allah and His Messenger. But if you repent, you shall have your capital sums; deal not unjustly, and you shall not be dealt with unjustly. And if the debtor is in a difficulty, grant him time till it is easy for him to repay. But if you remit it by way of charity, that is better for you if you know. And fear the Day when you shall be returned to Allah. Then every soul shall be paid in full what it has earned, and they shall not be wronged." Ibn Abbas (may Allah be pleased with them both) said that this is the last verse that was revealed to the Prophet (peace be upon him).

Narrated `Aun bin Abu Juhaifa: My father bought a slave who practiced the profession of cupping. (My father broke the slave's instruments of cupping). I asked my father why he had done so. He replied, "The Prophet forbade the acceptance of the price of a dog or blood, and also forbade the profession of tattooing, getting tattooed and receiving or giving Riba, (usury), and cursed the picture-makers."