عَنْ أُسَامَةُ بْنُ زَيْدٍ أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «الرِّبَا فِي النَّسِيئَةِ» . وَفِي رِوَايَةٍ قَالَ: «لَا رِبًا فِيمَا كَانَ يدا بيد»

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