Deuteronomy 25:15

A full and fair weight you shall have, a full and fair measure you shall have, that your days may be long in the land that the Lord your God is giving you.

You must have accurate and honest weights and measures, so that you may live long in the land the Lord your God is giving you.

But thou shalt have a perfect and just weight, a perfect and just measure shalt thou have: that thy days may be lengthened in the land which the Lord thy God giveth thee.