Leviticus 19:36,37
Just balances, just weights, a just ephah, and a just hin, shall you have: I am the LORD your God, which brought you out of the land of Egypt.
Nave's Topical Index—AKJV

Leviticus 25:14,17
And if you sell ought to your neighbor, or buy ought of your neighbor's hand, you shall not oppress one another:
Nave's Topical Index—AKJV