83:3
وَإِذَا كَالُوهُمْ أَو وَّزَنُوهُمْ يُخْسِرُونَ
wa-idhā kālūhum aw wazanūhum yukh'sirūna
but give less than they should when it is they who weigh or measure for others!
And when they have to give by measure or weight to (other) men, give less than due.