And thou shalt not let any of thy seed pass through the fire to Molech, neither shalt thou profane the name of thy God: I am the LORD. Pass through the fire to Molech - The name of this idol is mentioned for the first time in this place. As the word מלח molech or melech signifies king or governor, it is very likely that this idol represented the sun; and more particularly as the fire appears to have been so much employed in his worship. There are several opinions concerning the meaning of passing through the fire to Molech.
1. Some think that the semen humanum was offered on the fire to this idol.
2. Others think that the children were actually made a burnt-offering to him.
3. But others suppose the children were not burnt, but only passed through the fire, or between two fires, by way of consecration to him.
That some were actually burnt alive to this idol several scriptures, according to the opinion of commentators, seem strongly to intimate; see among others, Psalms 106:38; Jeremiah 7:31, and Ezekiel 23:37-39. That others were only consecrated to his service by passing between two fires the rabbins strongly assert; and if Ahaz had but one son, Hezekiah, (though it is probable he had others, see 2 Chronicles 28:3), he is said to have passed through the fire to Molech, 2 Kings 16:3, yet he succeeded his father in the kingdom, 2 Kings 18:1, therefore this could only be a consecration, his idolatrous father intending thereby to initiate him early into the service of this demon. See Clarke's note on Leviticus 20:2.