Charles Spurgeon Commentary Exodus 20:1-3

"And God spake all these words, saying, I am Jehovah thy God, who brought thee out of the land of Egypt, out of the house of bondage. Thou shalt have no other gods before me." — Exodus 20:1-3 (ASV)

God is the only God, and no other object of worship is to be tolerated for a moment.