When the Israelites arrive at Mt. Sinai, the Lord comes down on the mountain to meet with his people and make a covenant with them. He begins by giving the Israelites the Ten Commandments.
"I am the Lord your God, who brought you out of the land of Egypt, out of the house of slavery. You shall have no other gods before me. You shall not make for yourself a carved image...You shall not take the name of the Lord your God in vain." Exodus 20:1-7