Sunan an-Nasa'i

It was narrated that Suwaid bin Qais said: "Makhrafah Al-Abdi and I brought some cloth from Hajar, and the Messenger of Allah came to us while we were in Mina where there w a man who weighed (goods) in return for payment. He bought some trousers from us, and said to the man who weighed: “Weigh it, and allow more”"