Let the Reader remark with me, in the perusal of these verses, the grounds on which the LORD enjoins sanctity of life and manners, and the very strong motives in which it is founded, namely, that the LORD is the GOD of his people in a covenant way, and that they are his people. So that being thus distinguished as the peculiar objects of his love, reason as well as revelation seems to demand that they should be the peculiar followers of his holy law. See what Moses elsewhere saith of this, Deuteronomy 33:29.
Leviticus 20:21-27
21 And if a man shall take his brother's wife, it is an unclean thing: he hath uncovered his brother's nakedness; they shall be childless.
22 Ye shall therefore keep all my statutes, and all my judgments, and do them: that the land, whither I bring you to dwell therein, spue you not out.
23 And ye shall not walk in the manners of the nation, which I cast out before you: for they committed all these things, and therefore I abhorred them.
24 But I have said unto you, Ye shall inherit their land, and I will give it unto you to possess it, a land that floweth with milk and honey: I am the LORD your God, which have separated you from other people.
25 Ye shall therefore put difference between clean beasts and unclean, and between unclean fowls and clean: and ye shall not make your souls abominable by beast, or by fowl, or by any manner of living thing that creepethc on the ground, which I have separated from you as unclean.
26 And ye shall be holy unto me: for I the LORD am holy, and have severed you from other people, that ye should be mine.
27 A man also or woman that hath a familiar spirit, or that is a wizard, shall surely be put to death: they shall stone them with stones: their blood shall be upon them.