We have set up a qarḍ al- ḥasnah fund among our fellow workers. Every month one member receives the collected money by lots. After the fifth month, with the consent of all members each person pays an extra amount so that the next persons, for whom it takes longer to get it, receive a larger amount, and so on; is it considered as a case of ribā?
If the Imam of the congregation inadvertently makes a mistake in recitation but continues his prayer, can his prayer be considered correct and followed for the next prayers, or should it be established that he recites his next prayers correctly and correctly?
I lent money to a friend of mine and after a few months, he returned me the money plus some extra as a gift. He, himself, suggested to pay more and the extra money was his. Is receiving the extra amount considered as ribā?