17:35
وَ أَوْفُ وا۟ ٱلْ كَيْلَ إِذَا كِلْ تُمْ وَ زِنُ وا۟ بِ ٱلْ قِسْطَاسِ ٱلْ مُسْتَقِيمِ ذَٰلِكَ خَيْرٌ وَ أَحْسَنُ تَأْوِيلًا
And give full measure when you measure, and weigh with an even balance. That is the best [way] and best in result.
83:3
وَ إِذَا كَالُ و هُمْ أَو وَّزَنُ و هُمْ يُخْسِرُ ونَ
But if they give by measure or by weight to them, they cause loss.