Perfect - As in Genesis 17:1; Job 1:1; Matthew 5:48. The sense is that Israel was to keep the worship of the true God wholly uncontaminated by idolatrous pollutions.

Thou shalt be perfect with the Lord thy God. Sincerely serve and worship him, faithfully adhere to his word, laws, statutes, and ordinances, and walk uprightly before him.

Israel, on the other hand, was to be blameless with Jehovah (עם, in its intercourse with the Lord). Though the heathen whom they exterminated before them hearkened to conjurers and soothsayers, Jehovah their God had not allowed anything of the kind to them. ואתּה is placed first as a nominative absolute, for the sake of emphasis: "but thou, so far as thou art concerned, not so." כּן, thus, just so, such things (cf. Exodus 10:14). נתן, to grant, to allow (as in Genesis 20:6, etc.).

Thou shalt be {f} perfect with the LORD thy God.

(f) Without hypocrisy or mixture or false religion.

18:13 Perfect - Sincerely and wholly his, seeking him and cleaving to him and to his word alone, and therefore abhorring all commerce and conversations with devils.

perfect: or, upright, or, sincere

18:9-14 Was it possible that a people so blessed with Divine institutions, should ever be in any danger of making those their teachers whom God had made their captives? They were in danger; therefore, after many like cautions, they are charged not to do after the abominations of the nations of Canaan. All reckoning of lucky or unlucky days, all charms for diseases, all amulets or spells to prevent evil, fortune-telling, &c. are here forbidden. These are so wicked as to be a chief cause of the rooting out of the Canaanites. It is amazing to think that there should be any pretenders of this kind in such a land, and day of light, as we live in. They are mere impostors who blind and cheat their followers.