الاسراۤء — Al-Isra' Ayat 35

وَاَوْفُوا الْكَيْلَ اِذَا كِلْتُمْ وَزِنُوْا بِالْقِسْطَاسِ الْمُسْتَقِيْمِۗ ذٰلِكَ خَيْرٌ وَّاَحْسَنُ تَأْوِيْلًا

Wa auful-kaila iżā kiltum wa zinū bil-qisṭāsil-mustaqīm(i), żālika khairuw wa aḥsanu ta'wīlā(n).

"And give full measure when you measure, and weigh with an even balance. That is the best [way] and best in result."