What had the Prophet Muhammad (peace be upon him) said regarding someone who refused to pay a debt unless the debtor disbelieved in him?
 Narrated Khabbab:                     I was a blacksmith and did some work for Al-`As bin Wail. When he owed me some money for my work, I went to him to ask for that amount. He said, "I will not pay you unless you disbelieve in Muhammad." I said, "By Allah! I will never do that till you die and be resurrected." He said, "Will I be dead and then resurrected after my death?" I said, "Yes." He said, "There I will have property and offspring and then I will pay you your due." Then Allah revealed. 'Have you seen him who disbelieved in Our signs, and yet says: I will be given property and offspring?' (19.77)