“Abu Ja‘far (a.s.), has said, ‘ Riba ’ does not apply in the case of a man and his sons, his slave and his wife. Riba ’ applies when you do not own certain goods.’ I then asked, ‘Does it apply between me and the pagans?’ He (the Imam) replied, ‘Yes, it applies.’ I said, ‘They are slaves.’ He (the Imam) said, ‘You do not own them. You own them along with others. You and people other than you are equal about them. What is between you and them is not of that nature; your slave is not like the slave who is your slave as well as the slave of someone other than you.’”