Narrated Abu Sa`id: We used to be given mixed dates (from the booty) and used to sell (barter) two Sas of those dates) for one Sa (of good dates). The Prophet said (to us), "No (bartering of) two Sas for one Sa nor two Dirhams for one Dirham is permissible", (as that is a kind of usury). (See Hadith No. 405).

Narrated Abu Mas`ud: An Ansari man, called Abu Shu'aib, came and told his butcher slave, "Prepare meals sufficient for five persons, for I want to invite the Prophet along with four other persons as I saw signs of hunger on his face." Abu Shu'aib invited them and another person came along with them. The Prophet said (to Abu Shu'aib), This man followed us, so if you allow him, he will join us, and if you want him to return, he will go back." Abu Shu'aib said, "No, I have allowed him (i.e. he, too, is welcomed to the meal).

Narrated Hakim bin Hizam: The Prophet aid, "The buyer and the seller have the option to cancel or to confirm the deal, as long as they have not parted or till they part, and if they spoke the truth and told each other the defects of the things, then blessings would be in their deal, and if they hid something and told lies, the blessing of the deal would be lost."

Narrated Abu Hurairah (ra): The Prophet (saws) said "Certainly a time will come when people will not bother to know from where they earned the money, by lawful means or unlawful means." (See Hadith no. 2050)

And the statement of Allah, the Exalted: "Those who consume usury will not stand [on the Day of Resurrection] except as one stands who is being beaten by Satan into insanity. That is because they say, 'Trade is [just] like usury.' But Allah has permitted trade and has forbidden usury. So whoever has received an admonition from his Lord and desists may have what is past, and his affair rests with Allah. But whoever returns [to dealing in usury or interest] —those are the companions of the Fire; they will abide eternally therein."

Narrated Aisha: When the last Verses of Surat al- Baqara were revealed, the Prophet recited them in the mosque and proclaimed the trade of alcohol as illegal.

Narrated Samura bin Jundab: The Prophet said, "This night I dreamt that two men came and took me to a Holy land whence we proceeded on till we reached a river of blood, where a man was standing, and on its bank was standing another man with stones in his hands. The man in the middle of the river tried to come out, but the other threw a stone in his mouth and forced him to go back to his original place. So, whenever he tried to come out, the other man would throw a stone in his mouth and force him to go back to his former place. I asked, 'Who is this?' I was told, 'The person in the river was a Riba-eater."

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."

Narrated Abu Huraira: I heard Allah's Apostle saying, "The swearing (by the seller) may persuade the buyer to purchase the goods but that will be deprived of Allah's blessing."