'Just Weight' in the Bible

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.

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.

A false balance is abomination to the LORD: but a just weight is his delight.

A just weight and balance are the LORD'S: all the weights of the bag are his work.