“I once said to abu ‘Abd Allah (a.s.), ‘Most of my clients are from our brothers (in belief). I request you to set for me a limit, how should I deal with them in a transaction so that I will not go beyond that limit.’ He (the Imam) said, ‘If you consider your brother (in belief) as the person in charge it is fine, otherwise, deal with him in a transaction as one deals with a well aware hairsplitting person.”’