Narrated by Sayyiduna Abu Sa'id Khudri (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) distributed among them such grain that some of it was better than the other. Because of this, we began to sell it among ourselves with an increase and decrease, but the Messenger of Allah (peace and blessings be upon him) forbade us from making such a sale, except that it should be equal in measure and there should be no excess on either side.