[Machine] That Hakim ibn Hizam and Uthman ibn Affan used to bring food from the land of Qainuqa'a to the city and sell it by weight. Then the Messenger of Allah came to them and said, "What is this?" They said, "O Messenger of Allah, we bring it from the land of such and such and we sell it by weight." He said, "Do not do that. When you buy food, measure it, and when you sell it, weigh it." And it was narrated from Abu Zubair from Jabir.  

أَنَّ حَكِيمَ بْنَ حِزَامٍ وَعُثْمَانَ بْنَ عَفَّانَ كَانَا يَجْلِبَانِ الطَّعَامَ مِنْ أَرْضِ قَيْنُقَاعَ إِلَى الْمَدِينَةِ فَيَبِيعَانِهِ بِكَيْلِهِ فَأَتَى عَلَيْهِمْ رَسُولُ اللهِ ﷺ فَقَالَ مَا هَذَا؟ فَقَالَا يَا رَسُولَ اللهِ جَلَبْنَاهُ مِنْ أَرْضِ كَذَا وَكَذَا وَنَبِيعُهُ بِكَيْلِهِ قَالَ لَا تَفْعَلَا ذَلِكَ إِذَا اشْتَرَيْتُمَا طَعَامًا فَاسْتَوْفِيَاهُ فَإِذَا بِعْتُمَاهُ فَكِيلَاهُ وَرُوِيَ عَنْ أَبِي الزُّبَيْرِ عَنْ جَابِرٍ