34.51 Weighing goods by the seller or the giver
٣٤۔٥١ باب الْكَيْلِ عَلَى الْبَائِعِ وَالْمُعْطِي
[Machine] According to the saying of Allah the Exalted: "And when they measure or weigh for them, they cause loss." It means they measure or weigh for themselves, similar to His saying: "They listen to you," meaning they listen to you. And the Prophet ﷺ said: "Sell products with measurement, until you both agree." It is also mentioned about Uthman (may Allah be pleased with him) that the Prophet ﷺ said to him: "When you buy, eat, and when you sell, weigh."
لِقَوْلِ اللَّهِ تَعَالَى: {وَإِذَا كَالُوهُمْ أَوْ وَزَنُوهُمْ يُخْسِرُونَ} يَعْنِي كَالُوا لَهُمْ وَوَزَنُوا لَهُمْ كَقَوْلِهِ: {يَسْمَعُونَكُمْ} يَسْمَعُونَ لَكُمْ. وَقَالَ النَّبِيُّ ﷺ: «اكْتَالُوا حَتَّى تَسْتَوْفُوا». وَيُذْكَرُ عَنْ عُثْمَانَ ؓ أَنَّ النَّبِيَّ ﷺ قَالَ لَهُ: «إِذَا بِعْتَ فَكِلْ، وَإِذَا ابْتَعْتَ فَاكْتَلْ».