Deuteronomy 25:13-16

13“You shall not have in your bag inaccurate weights, a heavy and a light [so you can cheat others].

14You shall not have in your house inaccurate measures, a large and a small.

15You shall have a perfect (full) and just weight, and a perfect and just measure, so that your days may be long in the land which the Lord your God gives you.

16For everyone who does such things, everyone who acts unjustly [without personal integrity] is utterly repulsive to the Lord your God.