Deuteronomy 25:13-16 - Honest Weights And Measures
13 Do not have in your bag different weights, a great and a small; 14 Or in your house different measures, a great and a small. 15 But have a true weight and a true measure: so that your life may be long in the land which the Lord your God is giving you. 16 For all who do such things, and all whose ways are not upright, are disgusting to the Lord your God.