"Honest balance, honest weights, an honest dry measure and an honest liquid measure, you shall have"Leviticus 19:36.

We are commanded to have precise and "righteous" measuring implements—scales, weights, and measures.

The Midrash says: "Conditional on this I took you out of Egypt—on condition that you accept the mitzvah of [honest] measures. For one who acknowledges the mitzvah of measures, also acknowledges the Exodus from Egypt; and one who rejects the mitzvah of measures, also denies the Exodus from Egypt."