Leviticus 18

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 crow, 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.

24. Defile not yourselves in any of these things--In the preceding verses seventeen express cases of incest are enumerated; comprehending eleven of affinity [ Leviticus 18:7-16 ], and six of consanguinity [ Leviticus 18:17-20 ], together with some criminal enormities of an aggravated and unnatural character. In such prohibitions it was necessary for the instruction of a people low in the scale of moral perception, that the enumeration should be very specific as well as minute; and then, on completing it, the divine lawgiver announces his own views of these crimes, without any exception or modification, in the remarkable terms employed in this verse.
in all these the nations are defiled which I cast out before you, &c.--Ancient history gives many appalling proofs that the enormous vices described in this chapter were very prevalent, nay, were regularly practised from religious motives in the temples of Egypt and the groves of Canaan; and it was these gigantic social disorders that occasioned the expulsion, of which the Israelites were, in the hands of a righteous and retributive Providence, the appointed instruments ( Genesis 15:16 ). The strongly figurative language of "the land itself vomiting out her inhabitants" [ Leviticus 18:25 ], shows the hopeless depth of their moral corruption.

25. therefore I do visit the iniquity thereof upon it; and the land itself vomiteth out her inhabitants--The Canaanites, as enormous and incorrigible sinners, were to be exterminated; and this extermination was manifestly a judicial punishment inflicted by a ruler whose laws had been grossly and perseveringly outraged. But before a law can be disobeyed, it must have been previously in existence; and hence a law, prohibiting all the horrid crimes enumerated above--a law obligatory upon the Canaanites as well as other nations--was already known and in force before the Levitical law of incest was promulgated. Some general Iaw, then, prohibiting these crimes must have been published to mankind at a very early period of the world's history; and that law must either have been the moral law, originally written on the human heart, or a law on the institution of marriage revealed to Adam and known to the Canaanites and others by tradition or otherwise.

29. the souls that commit them shall be cut off--This strong denunciatory language is applied to all the crimes specified in the chapter without distinction: to incest as truly as to bestiality, and to the eleven cases of affinity [ Leviticus 18:7-16 ], as fully as to the six of consanguinity [ Leviticus 18:17-20 ]. Death is the punishment sternly denounced against all of them. No language could be more explicit or universal; none could more strongly indicate intense loathing and abhorrence.

30. Therefore shall ye keep mine ordinance, that ye commit not any one of these abominable customs--In giving the Israelites these particular institutions, God was only re-delivering the law imprinted on the natural heart of man; for there is every reason to believe that the incestuous alliances and unnatural crimes prohibited in this chapter were forbidden to all men by a law expressed or understood from the beginning of the world, or at least from the era of the flood, since God threatens to condemn and punish, in a manner so sternly severe, these atrocities in the practice of the Canaanites and their neighbors, who were not subject to the laws of the Hebrew nation.