18:1-30 Unlawful marriages and fleshly lusts. - Here is a law against all conformity to the corrupt usages of the heathen. Also laws against incest, against brutal lusts, and barbarous idolatries; and the enforcement of these laws from the ruin of the Canaanites. God here gives moral precepts. Close and constant adherence to God's ordinances is the most effectual preservative from gross sin. The grace of God only will secure us; that grace is to be expected only in the use of the means of grace. Nor does He ever leave any to their hearts' lusts, till they have left him and his services.
21. thou shalt not let any of thy seed pass through the fire to Molech, &c.—Molech, or Moloch, which signifies "king," was the idol of the Ammonites. His statue was of brass, and rested on a pedestal or throne of the same metal. His head, resembling that of a calf, was adorned with a crown, and his arms were extended in the attitude of embracing those who approached him. His devotees dedicated their children to him; and when this was to be done, they heated the statue to a high pitch of intensity by a fire within, and then the infants were either shaken over the flames, or passed through the ignited arms, by way of lustration to ensure the favor of the pretended deity. The fire-worshippers asserted that all children who did not undergo this purifying process would die in infancy; and the influence of this Zabian superstition was still so extensively prevalent in the days of Moses, that the divine lawgiver judged it necessary to prohibit it by an express statute.
neither shalt thou profane the name of thy God—by giving it to false or pretended divinities; or, perhaps, from this precept standing in close connection with the worship of Molech, the meaning rather is, Do not, by devoting your children to him, give foreigners occasion to blaspheme the name of your God as a cruel and sanguinary deity, who demands the sacrifice of human victims, and who encourages cruelty in his votaries.