Sunan Abi Dawud, Hadith 3320 ⓘ
Narrated Qays ibn AbuGharazah: In the time of the Messenger of Allah we used to be called brokers, but the Prophet came upon us one day, and called us by a better name than that, saying: O company of merchants, unprofitable speech and swearing takes place in business dealings, so mix it with sadaqah (alms).
حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا أَبُو مُعَاوِيَةَ، عَنِ الأَعْمَشِ، عَنْ أَبِي وَائِلٍ، عَنْ قَيْسِ بْنِ أَبِي غَرَزَةَ، قَالَ كُنَّا فِي عَهْدِ رَسُولِ اللَّهِ صلى الله عليه وسلم نُسَمَّى السَّمَاسِرَةَ فَمَرَّ بِنَا رَسُولُ اللَّهِ صلى الله عليه وسلم فَسَمَّانَا بِاسْمٍ هُوَ أَحْسَنُ مِنْهُ فَقَالَ " يَا مَعْشَرَ التُّجَّارِ إِنَّ الْبَيْعَ يَحْضُرُهُ اللَّغْوُ وَالْحَلِفُ فَشُوبُوهُ بِالصَّدَقَةِ " .
also referenced under: Hadith 3326 (DarusSalam) & Book 22, Hadith 3320 (USC-MSA)