Those who consume interest1 cannot 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 interest." But Allāh has permitted trade and has forbidden interest. So whoever has received an admonition from his Lord and desists may have what is past, and his affair rests with Allāh. But whoever returns [to dealing in interest or usury] - those are the companions of the Fire; they will abide eternally therein.
Translation: Saheeh International (English)
1 Included is that given on commercial as well as consumer loans.
Those who take interest will rise from their graves on the Day of Resurrection like a person who is afflicted by Satan: they will stand up from their graves and then fall like a person who is epileptic. This is because they made usury permissible and made no distinction between usury and that which Allah has permitted in terms of profit earned through sales transactions. They claimed, ‘Sale is like usury’, meaning that both are lawful since both lead to an increase in wealth. Allah refutes their comparison and explains that He has permitted sale because of the general and specific benefit it contains, and He has prohibited usury because it is oppressive and abusive of people’s wealth. The person who stops taking usury, and repents from his sin, after receiving Allah’s instruction prohibiting it and warning him against it, may keep the usury that he received in the past, without any sin. Then, whatever he does from then on, Allah will judge it. Whoever returns to taking usury after knowing of the prohibition deserves to enter the fire of Hell and to remain there eternally. The reference to remaining in the fire of Hell eternally in relation to those that believe in Allah’s Oneness is an indication of a long period of time; for only disbelievers will actually remain eternally in the fire of Hell.