Deuteronomy 25:13-16

Don’t carry around with you two weights, one heavy and the other light, and don’t keep two measures at hand, one large and the other small. Use only one weight, a true and honest weight, and one measure, a true and honest measure, so that you will live a long time on the land that GOD, your God, is giving you. Dishonest weights and measures are an abomination to GOD, your God—all this corruption in business deals!