عَنْ قَيْسِ بْنِ أَبِي غَرَزَةَ رَضِيَ اللَّهُ عَنْهُ قَالَ كُنَّا نُسَمَّى السَّمَاسِرَةَ عَلَى عَهْدِ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ وَفِي لَفْظٍ كُنَّا نَبِيعُ الرَّقِيقَ فِي السُّوقِ وَفِي لَفْظٍ آخَرَ كُنَّا نَبْتَاعُ الْأَوْسَاقَ بِالْمَدِينَةِ فَأَتَانَا رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ بِالْبَقِيعِ فَقَالَ يَا مَعْشَرَ التُّجَّارِ فَسَمَّانَا بِاسْمٍ أَحْسَنَ مِنْ اسْمِنَا وَفِي لَفْظٍ أَحْسَنَ مِمَّا سَمَّيْنَا بِهِ أَنْفُسَنَا فَقَالَ إِنَّ الْبَيْعَ يَحْضُرُهُ الْحَلِفُ وَالْكَذِبُ فَشُوبُوهُ بِالصَّدَقَةِ وَفِي لَفْظٍ إِنَّ هَذِهِ السُّوقَ يُخَالِطُهَا اللَّغْوُ وَحَلْفٌ فَشُوبُوهَا بِصَدَقَةٍ
Narrated from Sayyiduna Qais bin Garzah (may Allah be pleased with him), he says: In the time of the Messenger of Allah (peace and blessings be upon him), we (traders) were called samasir, that is, brokers. In one narration it is stated: We used to sell slaves in the market. In another narration it is stated: We used to sell goods in Madinah Munawwarah. Once, the Messenger of Allah (peace and blessings be upon him) came to us in Baqi‘ and said: O group of traders! Thus, he (peace and blessings be upon him) gave us a better name than our previous one. In one narration it is stated: The name we had chosen for ourselves, he (peace and blessings be upon him) gave us a better name than that. Also, he (peace and blessings be upon him) said: In trade, unlawful oaths and lies become mixed, so give charity along with it. In one narration it is stated: In these markets, idle talk and false oaths are common, so give charity along with them.