Thou shalt have no other gods before me.
Exodus 20:3 Thou shalt have no other gods before me. In this commandment God enjoins that He alone should be worshipped, and requires a worship free from all superstition. For although it seems to be a simple prohibition, yet must we deduce an affirmation from the negative, as will be more apparent from the following words.
God spoke these words Himself with dreadful pomp, not merely whispered through conscience or providence, but with the authority of Jehovah, the self-existent One. He bound Israel threefold: by His nature as eternal Lord, by covenant as their God, and by His power to reward obedience and punish disobedience.
AI summary
Commenting on Exodus 20:1-11
Thou shalt have no other gods before me. This is the first command, and is opposed to the polytheism of the Gentiles, the Egyptians, from whom Israel was just come, and whose gods some of them might have had a favourable opinion of and liking to, and had committed idolatry with; and the Canaanites, into whose land they were going; and to prevent their joining...