Sura al-Raḥmān 55:9

وَأَقِيمُوا۟ ٱلْوَزْنَ بِٱلْقِسْطِ وَلَا تُخْسِرُوا۟ ٱلْمِيزَانَ

wa-aqīmū l-wazna bil-qisṭi wa-lā tukhsirū l-mīzāna

So establish weight with justice and fall not short in the balance.

Sura al-Muṭaffifīn 83:3

وَإِذَا كَالُوهُمْ أَو وَّزَنُوهُمْ يُخْسِرُونَ

wa-idhā kālūhum aw- wazanūhum yukhsirūna

But when they have to give by measure or weight to men, give less than due.