Deuteronomy 4:14-20

Verse 15

Ye saw no manner of similitude - Howsoever God chose to appear or manifest himself, he took care never to assume any describable form. He would have no image worship, because he is a Spirit, and they who worship him must worship him in Spirit and in truth. These outward things tend to draw the mind out of itself, and diffuse it on sensible, if not sensual, objects; and thus spiritual worship is prevented, and the Holy Ghost grieved. Persons acting in this way can never know much of the religion of the heart.
Verse 16

The likeness of male or female - Such as Baal-peor and the Roman Priapus, Ashtaroth or Astarte, and the Greek and Roman Venus; after whom most nations of the world literally went a whoring.
Verse 17

The likeness of any beast, etc. - Such as the Egyptian god Apis, who was worshipped under the form of a white bull; the ibis and hawk, among the fowls, had also Divine honors paid to them; serpents and the crocodile among reptiles; besides monkeys, dogs, cats, the scarabaeus, leeks, and onions! See this explained at large, Exo 20:4 (note).
Verse 19

When thou seest the sun, and the moon, and the stars - The worship of the heavenly bodies was the oldest species of idolatry. Those who had not the knowledge of the true God were led to consider the sun, moon, planets, and stars, as not only self-existing, but the authors of all the blessings possessed by mankind. The knowledge of a rational system of astronomy served to destroy this superstition; and very little of it remains now in the world, except among a few Christian and Mohammedan astrologers; those miserable sinners who endeavor, as much as possible, to revive the old idolatry, while vainly professing to believe in the true God! Nor is it to be doubted that God will proceed with them as he has done of old with the worshippers of the host of heaven. Sound philosophy is next in importance to sound divinity; and next to the study of the work of grace is that of the operations of God in nature; for these visible things make known his eternal power and Godhead.
Verse 20

Out of the iron furnace - From this mention of the word iron furnace there can be little doubt that the Israelites were employed in Egypt in the most laborious works of metallurgy. Digging, smelting, and forging of iron in so hot a climate must have been oppressive work indeed.
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