Thou shalt have. The use of the second person singular is remarkable when a covenant was being made with the people (Exodus 19:5). The form indicated that each individual of the nation was addressed severally, and was required himself to obey the law, a mere general national obedience being insufficient.
No one can fail to see how much the commands gain in force, through all time, by being thus addressed to the individual conscience. No other gods before me. "Before me" literally, "before my face," is a Hebrew idiom, and equivalent to "beside me," "in addition to me."
The commandment requires the worship of one God alone, Jehovah—the God who had in so ninny ways manifested himself to the Israelites, and implies that there is, in point of fact, no other God. A belief in the unity of God is said to lie at the root of the esoteric Egyptian religion; but Moses can scarcely have derived his belief from this source, since the Egyptian notions on the subject were tinged with pantheism and materialism, from which the religion of Moses is entirely free.
Outwardly the Egyptian religion, like that of the nations of Western Asia generally, was a gross polytheism; and it is against polytheistic notions that the first commandment raises a protest.