Question: Two brothers share in building a house. So one of them takes money from a bank and the second brother does not know and he does not tell him except after the house is built. So what is obligatory upon the second brother?
Answer: “I hope that there is no sin upon him because he did not know. Next, the sin is upon the one who directly [deals with usury]. As for the one who was afflicted with this and he did not directly [deal with it], then there is no sin upon him. The sin is upon the one who directly [deals with it]. Cautiousness is to leave it off and there is a difference between cautiousness and prohibition”.
Faisal bin Abdul Qaadir bin Hassan