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Deuteronomy 25:13-16
New International Version (NIV)
Do not have two differing weights in your bag—one heavy, one light. Do not have two differing measures in your house—one large, one small. You must have accurate and honest weights and measures, so that you may live long in the land the LORD your God is giving you. For the LORD your God detests anyone who does these things, anyone who deals dishonestly.
You should put your house in order pertaining to honesty and justice first and everything else should follow. Do not have a differing measure between one and the other. Do not practice double standards, in other words. Put your house in order!
If you deal dishonestly with those outside your influence or family, watch it! There is a God who deals all matters related to man with honesty and justice. He will act justly against you soon! Dishonesty will amount to cheating and cheating will amount to displeasure to the LORD where He will unleash His wrath on you.
No, do not ever think you could do magic before the eyes of others and get away with it. Not so easily with the LORD who weighs every actions of man justly. He will pay back all those who have cheated and have been cheated of their honest living. The LORD our God is fair and just and there is no one as strong as Him.