“I heard Amir al-Mu’minin (a.s.), saying from the pulpit, ‘O people who do business, you must learn fiqh (laws), then go in business, you must learn fiqh (laws) then go in business, you must learn fiqh (laws) then go in business. I swear by Allah, Riba ’ creeps in this nation more quietly than an ant’s moving on a hard and smooth rock. Blend your belief with truthfulness. A sinful business person is a criminal, and a criminal person is in the fire except those who take what is right and give what is right.’”