Deuteronomy 25:13-19

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.

17“Remember what Amalek did to you along the road when you came from Egypt,

18how he met you along the road and attacked all the stragglers at your rear when you were tired and weary; and he did not fear God.

19Therefore when the Lord your God has given you rest from all your surrounding enemies, in the land which the Lord your God gives you as an inheritance to possess, you shall wipe out the memory of Amalek from under heaven; you must not forget.