Musnad Ahmad 285:0

Qays ibn Abi Gharzah reported: We used to be called "brokers" during the time of the Messenger of Allah (ﷺ) in Medina. The Messenger of Allah (ﷺ) passed by us and called us by a name better than that. He said, "O company of merchants, indeed, selling is attended by vain talk and swearing, so mix it with charity."