Surah Al-Baqarah (The Cow), Verse 275

اَلَّذِیْنَ یَاْكُلُوْنَ الرِّبٰوا لَا یَقُوْمُوْنَ اِلَّا كَمَا یَقُوْمُ الَّذِیْ یَتَخَبَّطُهُ الشَّیْطٰنُ مِنَ الْمَسِّ ذٰلِكَ بِاَنَّهُمْ قَالُوْۤا اِنَّمَا الْبَیْعُ مِثْلُ الرِّبٰوا وَاَحَلَّ اللّٰهُ الْبَیْعَ وَحَرَّمَ الرِّبٰوا فَمَنْ جَآءَهٗ مَوْعِظَةٌ مِّنْ رَّبِّهٖ فَانْتَهٰی فَلَهٗ مَا سَلَفَ وَاَمْرُهٗۤ اِلَی اللّٰهِ وَمَنْ عَادَ فَاُولٰٓىِٕكَ اَصْحٰبُ النَّارِ هُمْ فِیْهَا خٰلِدُوْنَ ۟

Allazeena yaakuloonar ribaa laa yaqoomoona illaa kamaa yaqoomul lazee yatakhabbatuhush shaitaanu minal mass; zaalika bi annahum qaalooo innamal bai'u mislur ribaa; wa ahallal laahul bai'a wa harramar ribaa; faman jaaa'ahoo maw'izatum mir rabbihee fantahaa falahoo maa salafa wa amruhooo ilal laahi wa man 'aada fa ulaaa 'ika Ashaabun naari hum feehaa khaalidoon

“Those who devour usury will not stand except as stand one whom the Evil one by his touch Hath driven to madness. That is because they say: "Trade is like usury," but Allah hath permitted trade and forbidden usury. Those who after receiving direction from their Lord, desist, shall be pardoned for the past; their case is for Allah (to judge); but those who repeat (The offence) are companions of the Fire: They will abide therein (for ever).”

Quran 2:275 (Yusuf Ali Translation)