Mishkat al-Masabih
Mishkat al-Masabih 2826
Usury - Section 3
Arabic hadith text
وَعَنْ أَبِي هُرَيْرَةَ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «الرِّبَا سَبْعُونَ جُزْءًا أيسرها أَن الرجل أمه»
Translation
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