Surah Al-Isra 17:35
وَأَوْفُوا۟ ٱلْكَيْلَ إِذَا كِلْتُمْ وَزِنُوا۟ بِٱلْقِسْطَاسِ ٱلْمُسْتَقِيمِ ۚ ذَٰلِكَ خَيْرٌ وَأَحْسَنُ تَأْوِيلًا ٣٥
EnglishSahih International
And give full measure when you measure, and weigh with an even balance. That is the best [way] and best in result.