قَالَ أَمِيرُ الْمُؤْمِنِينَ ع لَيْسَ بَيْنَ الرَّجُلِ وَ وَلَدِهِ رِبًا وَ لَيْسَ بَيْنَ السَّيِّدِ وَ عَبْدِهِ رِبًا[2].
“Abu ‘ Abd Allah (a.s.), has said that Amir al-Mu’minin (a.s.), has said, ‘There is no Riba ’ between a man and his sons as well between a master and his slave.”’