Will the Lord be pleased with thousands of rams,
    with ten thousand rivers of olive oil?
Shall I offer my firstborn for my transgression,
    the fruit of my body for the sin of my soul?
He has shown you, O mortal, what is good.
    And what does the Lord require of you?
To act justly and to love mercy
    and to walk humbly[a] with your God.

Israel’s Guilt and Punishment

Listen! The Lord is calling to the city—
    and to fear your name is wisdom—
    “Heed the rod and the One who appointed it.

This is it. The calling of God’s people is to act justly, to love mercy, and to walk humbly with our God.

Acting justly includes fair weights and measures. God hates when people are cheated. This is an abomination to him.

In fact in the very next verses he says so:

10 Am I still to forget your ill-gotten treasures, you wicked house,
    and the short ephah,[c] which is accursed?
11 Shall I acquit someone with dishonest scales,
    with a bag of false weights?
12 Your rich people are violent;
    your inhabitants are liars
    and their tongues speak deceitfully.

You may think it is alright to cheat someone but God doesn’t agree with you. If you’ve ever been robbed you know how it feels. This is something you would never do to another person. That is why God gave us the golden rule. Do unto others as you would have them do unto you. That means don’t cheat. Don’t cheat God. Don’t cheat others. And most of all don’t cheat yourself.