The Final Appeal, emphasizing the motive of separation from the customs of the original inhabitants, complementary to that of fear of defilement (Leviticus 18:30). Refusal to make the due distinction between clean and unclean here singled out as typical of full observance entails expulsion by, as well as from, the land and rouses abhorrence (a strong and semi-physical loathing) in Yahweh Himself. Holiness in Israel's conduct is necessary as corresponding to Israel's own holiness or position of separation among the nations.
Leviticus 20:22-26
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.