"In Al-Madinah we used to buy and sell Wasqs (of goods), and we used to call ourselves Samasir (brokers), and the people used to call us like that. The Messenger of Allah came out to us one day, and called us by a name that was better than that which we called ourselves and which the people called us. He said: 'O Tujjar (traders), your selling involves (false) oaths and lies, so mix some charity with it.'" (Using translation from Nasāʾī 3800)  

كُنَّا فِي الْمَدِينَةِ نَبِيعُ الْأَوْسَاقَ وَنَبْتَاعُهَا وَكُنَّا نُسَمِّي أَنْفُسَنَا السَّمَاسِرَةَ وَيُسَمِّينَا النَّاسُ فَخَرَجَ عَلَيْنَا رَسُولُ اللَّهِ ﷺ ذَاتَ يَوْمٍ فَسَمَّانَا بِاسْمٍ هُوَ خَيْرٌ مِنَ الَّذِي سَمَّيْنَا أَنْفُسَنَا وَسَمَّانَا النَّاسُ فَقَالَ «يَا مَعْشَرَ التُّجَّارِ إِنَّهُ يَشْهَدُ بَيْعَكُمُ اللَّغْوُ وَالْحَلِفُ فَشُوبُوهُ بِصَدَقَةٍ»