Mishkat al-Masabih #2708
Business Transactions
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ أَبِي هُرَيْرَةَ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «الرِّبَا سَبْعُونَ جُزْءًا أيسرها أَن الرجل أمه»
Abu Huraira reported God’s Messenger as saying, "Usury has seventy parts, the least important being that a man should marry his mother.”
Ibn Majah and Baihaqi, in Shu'ab al-iman
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About Mishkat al-Masabih
This hadith is #2708 from Mishkat al-Masabih, in the Book of Business Transactions.