Qur'an 17:35

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.”

Al-Israa 17:35 · Saheeh International