Deuteronomy 25:13-16

25:13 You must not have in your bag different stone weights, a heavy and a light one. 25:14 You must not have in your house different measuring containers, a large and a small one. 25:15 You must have an accurate and correct stone weight and an accurate and correct measuring container, so that your life may be extended in the land the Lord your God is about to give you. 25:16 For anyone who acts dishonestly in these ways is abhorrent to the Lord your God.