Permissibility of returning a gift and accepting a returned gift

Q: What is the ruling on someone who was given a grant by his brother - and in Shari`ah (Islamic law) a grant is not to be returned - but he thought of it as a loan and wanted to repay it? Is there any sin in repaying the granted amount? What is the ruling on the granting brother who stresses it is not to be repaid and then asks for it and accepts it when paid?

A: There is no harm in returning the grant but it is not permissible for the granter to ask (Part No. 16; Page No. 250) for a repayment or to accept it. However, if the one granted refuses to consider it a grant, the granter has the right to take the repayment. May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.