“Once abu Ja’far (a.s.) said to me, ‘O Sulayman, do you know who a Muslim is?’ I said, ‘May Allah keep my soul in service for your cause, you know better. ’ The Imam said, ‘A Muslim is one from whose tongue and hands other Muslims are safe.’ Then the Imam said, ‘Do you know who a believer is?’ I said, ‘You know better.’ The Imam said, ‘A believer is one who is an accepted trustworthy person among the Muslims in their properties and lives. It is unlawful for a Muslim to be unjust toward a Muslim, betray him or push him aside in his helplessness.’”