John Calvin on Leviticus 18:21

18:21. Thou shalt not let any of thy seed. In these three precepts Moses more lightly touches on what we have lately seen set forth at greater length in Deuteronomy; for there he condemns impious offerings, as well as the responses of familiar spirits, magical arts, and enchantments. He now in the first place adverts to adulterous sacrifices, especially to that impure and detestable service of consecrating their children to Moloch, as they called him, the idol of the Gentiles; and then adds a prohibition, that they should give no heed to false revelations. But in these two passages of Leviticus he only enumerates two classes, “Il en raconte seulement quatre especes; mais il y comprend toutes celles que nous avons veus par ci-devant;” he mentions only four sorts, but comprehends in them all those which we have before observed. — Fr. viz., to use auguries and divinations, and to seek responses from familiar spirits, and to consult magicians or enchanters; yet he includes all the others of which we have previously spoken. And, lest they should think the crime a light one, he says that all they are “defiled” who devote themselves to this kind of curiosity. The confirmation, which is added at the end of both clauses, has relation to the sum of the First Commandment; for when God declares Himself to be “Jehovah, and the God of Israel,” he both claims the worship which is due to Him alone, and also condemns all the superstitions whereby pure religion is adulterated. There is also an antithesis implied, in which God contrasts Himself with all fictitious idols; and therefore the words may be thus paraphrased, — Since I am the eternal God, and separated from all others which the Gentiles foolishly make to themselves, and since I have chosen you to myself as my peculiar people, I would have you, as you ought to be, pure and separated from all defilements.

Deuteronomy 12

Deuteronomy 12:29-32

29. When the Lord thy God shall cut off the nations from before thee, whither thou goest to possess them, and thou succeedest them, and dwellest in their land;

29. Quum exciderit Jehova Deus tuns gentes ad quas tu venis possidendas a facie tua, et eas possederis, et habitaveris in terra ipsarum.

30. Take heed to thyself that thou be not snared by following them, after that they be destroyed from before thee; and that thou enquire not after their gods, saying, How did these nations serve their gods? even so will I do likewise.

30. Cave tibi ne to illaquees post ipsas, postquam deletae fuerint a facie tua: et ne inquiras ad deos earum, dicendo, Quomodo servierunt gentes istae diis suis, sic etiam ego faciam.

31. Thou shalt not do so unto the Lord thy God: for every abomination to the Lord which he hateth have they done unto their gods; for even their sons and their daughters they have burnt in the fire to their gods.

31. Non facies sic Jehovae Deo tuo: quia quicquid abominatio est Jehovae, et quod odit, fecerunt diis suis: quinetiam filios suos et filias suas combusserunt igni diis suis.

32. What thing soever I command you, observe to do it: thou shalt not add thereto, nor diminish from it.

32. Omne igitur verbum quod ego praecipio vobis, observabitis ad faciendum: non adjicies super illud, neque minues quicquam ex eo.