الَّذِينَ يَأْكُلُونَ الرِّبَا لاَ يَقُومُونَ إِلاَّ كَمَا يَقُومُ الَّذِي يَتَخَبَّطُهُ الشَّيْطَانُ مِنَ الْمَسِّ ذَلِكَ بِأَنَّهُمْ قَالُواْ إِنَّمَا الْبَيْعُ مِثْلُ الرِّبَا وَأَحَلَّ اللّهُ الْبَيْعَ وَحَرَّمَ الرِّبَا فَمَن جَاءهُ مَوْعِظَةٌ مِّن رَّبِّهِ فَانتَهَىَ فَلَهُ مَا سَلَفَ وَأَمْرُهُ إِلَى اللّهِ وَمَنْ عَادَ فَأُوْلَئِكَ أَصْحَابُ النَّارِ هُمْ فِيهَا خَالِدُونَ
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سورة البقرة
(2/275) Those who eat the Ribâ (Usury) will not rise from their graves except as one rises who is being beaten by Satan into insanity. That is because they say: “Trading is only like usury; however Allah has made trading lawful and forbidden usury”. To whomsoever then the admonition has come from his Lord, then he desists (from usury), so what has already passed (usury he had taken before) is for him and his affair belongs to Allah; and whoever returns (to usury), these are the inmates of the Fire; they shall abide in it forever.
Surah Al-Baqarah