Sayyiduna Suwaid bin Qais (may Allah be pleased with him) narrates: I and Makhrifah ‘Abdi bought cloth at the place of “Hajar.” The Prophet Muhammad (peace and blessings be upon him) came to us and made a deal with us for a pair of trousers. There was a person with you who used to weigh in exchange; the Prophet Muhammad (peace and blessings be upon him) said to him: “Weigh and give extra payment.”
(Imam Ibn Hibban, may Allah have mercy on him, says:) By this is meant: The Prophet Muhammad (peace and blessings be upon him) wanted to pay extra for the trousers from his own wealth.