Deuteronomy 25:13-16
Thou shalt not have in thy bag divers weights, a great and a small. Thou shalt not have in thine house divers measures, a great and a small. [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. For all that do such things, [and] all that do unrighteously, [are] an abomination unto the LORD thy God.

Hosea 12:7
[He is] a merchant, the balances of deceit [are] in his hand: he loveth to oppress.

Leviticus 6:2
If a soul sin, and commit a trespass against the LORD, and lie unto his neighbour in that which was delivered him to keep, or in fellowship, or in a thing taken away by violence, or hath deceived his neighbour; Or have found that which was lost, and lieth concerning it, and sweareth falsely; in any of all these that a man doeth, sinning therein: Then it shall be, because he hath sinned, and is guilty, that he shall restore that which he took violently away, or the thing which he hath deceitfully gotten, or that which was delivered him to keep, or the lost thing which he found, Or all that about which he hath sworn falsely; he shall even restore it in the principal, and shall add the fifth part more thereto, [and] give it unto him to whom it appertaineth, in the day of his trespass offering. And he shall bring his trespass offering unto the LORD, a ram without blemish out of the flock, with thy estimation, for a trespass offering, unto the priest: And the priest shall make an atonement for him before the LORD: and it shall be forgiven him for any thing of all that he hath done in trespassing therein.

Leviticus 19:35-36
Ye shall do no unrighteousness in judgment, in meteyard, in weight, or in measure. Just balances, just weights, a just ephah, and a just hin, shall ye have: I [am] the LORD your God, which brought you out of the land of Egypt.