Al Isra, 35 Ayah
17:35
وَأَوۡفُواْ ٱلۡكَيۡلَ إِذَا كِلۡتُمۡ وَزِنُواْ بِٱلۡقِسۡطَاسِ ٱلۡمُسۡتَقِيمِۚ ذَٰلِكَ خَيۡرٞ وَأَحۡسَنُ تَأۡوِيلٗا ٣٥
Wa 'Awfū Al-Kayla 'Idhā Kiltum Wa Zinū Bil-Qisţāsi Al-Mustaqīmi ۚ Dhālika Khayrun Wa 'Aĥsanu Ta'wīlāan
And give full measure when you measure, and weigh with an even balance. That is the best [way] and best in result.