Mishkat al-Masabih #2689
Business Transactions
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
عَنْ جَابِرٍ رَضِيَ اللَّهُ عَنْهُ قَالَ: لَعَنَ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ أَكَلَ الرِّبَا وَمُوَكِلَهُ وَكَاتِبَهُ وَشَاهِدَيْهِ وَقَالَ: «هُمْ سَوَاءٌ» . رَوَاهُ مُسلم
Jabir said that God's Messenger cursed the one who accepted usury, the one who paid it, the one who recorded it, and the two witnesses to it, saying they were all alike.
Muslim transmitted it.
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About Mishkat al-Masabih
This hadith is #2689 from Mishkat al-Masabih, in the Book of Business Transactions.