Al-Isra · Ayah 35
وَأَوْفُوا۟ ٱلْكَيْلَ إِذَا كِلْتُمْ وَزِنُوا۟ بِٱلْقِسْطَاسِ ٱلْمُسْتَقِيمِ ذَٰلِكَ خَيْرٌ وَأَحْسَنُ تَأْوِيلًا
And give full measure when you measure, and weigh with an even [i.e., honest] balance. That is the best [way] and best in result.
Quran 17:35 (Al-Isra) · Saheeh International, Noor International Center (QuranEnc v1.1.2)