It was narrated that Qais bin Abu Gharazah said: "At the time of the Messenger of Allah (ﷺ) we used to be called brokers, but the Messenger of Allah (ﷺ) passed by us and called by a name that was better than that. He said: 'O merchants, selling involves (false) oaths and idle talk, so mix some charity with it."'
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا مُحَمَّدُ بْنُ عَبْدِ اللَّهِ بْنِ نُمَيْرٍ، حَدَّثَنَا أَبُو مُعَاوِيَةَ، عَنِ الأَعْمَشِ، عَنْ شَقِيقٍ، عَنْ قَيْسِ بْنِ أَبِي غَرَزَةَ، قَالَ كُنَّا نُسَمَّى فِي عَهْدِ رَسُولِ اللَّهِ ـ صلى الله عليه وسلم ـ السَّمَاسِرَةَ فَمَرَّ بِنَا رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ فَسَمَّانَا بِاسْمٍ هُوَ أَحْسَنُ مِنْهُ فَقَالَ " يَا مَعْشَرَ التُّجَّارِ إِنَّ الْبَيْعَ يَحْضُرُهُ الْحَلِفُ وَاللَّغْوُ فَشُوبُوهُ بِالصَّدَقَةِ " .
sunnah.com