Quote from the Qur'an. Suratul Baqara: 275

ٱﻟَّﺬِﻳﻦَ ﻳَﺄْﻛُﻠُﻮﻥَ ٱﻟﺮِّﺑَﻮٰا۟ ﻻَ ﻳَﻘُﻮﻣُﻮﻥَ ﺇِﻻَّ ﻛَﻤَﺎ ﻳَﻘُﻮﻡُ ٱﻟَّﺬِﻯ ﻳَﺘَﺨَﺒَّﻄُﻪُ ٱﻟﺸَّﻴْﻄَٰﻦُ ﻣِﻦَ ٱﻟْﻤَﺲِّ ۚ ﺫَٰﻟِﻚَ ﺑِﺄَﻧَّﻬُﻢْ ﻗَﺎﻟُﻮٓا۟ ﺇِﻧَّﻤَﺎ ٱﻟْﺒَﻴْﻊُ ﻣِﺜْﻞُ ٱﻟﺮِّﺑَﻮٰا۟ ۗ ﻭَﺃَﺣَﻞَّ ٱﻟﻠَّﻪُ ٱﻟْﺒَﻴْﻊَ ﻭَﺣَﺮَّﻡَ ٱﻟﺮِّﺑَﻮٰا۟ ۚ ﻓَﻤَﻦ ﺟَﺎٓءَﻩُۥ ﻣَﻮْﻋِﻈَﺔٌ ﻣِّﻦ ﺭَّﺑِّﻪِۦ ﻓَﭑﻧﺘَﻬَﻰٰ ﻓَﻠَﻪُۥ ﻣَﺎ ﺳَﻠَﻒَ ﻭَﺃَﻣْﺮُﻩُۥٓ ﺇِﻟَﻰ ٱﻟﻠَّﻪِ ۖ ﻭَﻣَﻦْ ﻋَﺎﺩَ ﻓَﺄُﻭ۟ﻟَٰٓﺌِﻚَ ﺃَﺻْﺤَٰﺐُ ٱﻟﻨَّﺎﺭِ ۖ ﻫُﻢْ ﻓِﻴﻬَﺎ ﺧَٰﻠِﺪُﻭﻥ

َ Allatheena yakuloona alrriba la yaqoomoona illa kama yaqoomu allathee yatakhabbatuhu alshshaytanu mina almassi thalika biannahum qaloo innama albayAAu mithlu alrriba waahalla Allahu albayAAa waharrama alrriba faman jaahu mawAAithatun min rabbihi faintaha falahu ma salafa waamruhu ila Allahi waman AAada faolaika ashabu alnnari hum feeha khalidoona

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).