(2) I am the Lord your God.--The Lord is their recognised and sole sovereign, the children of Israel are therefore bound to obey His precepts, and not be led astray by the customs or statutes which prevailed among the people whose country they are to possess. Moreover, as He is holy, the Israelites, by faithfully obeying His sacred laws, will attain to that holiness which will bring them in communion with Him in whose image they were created. This phrase, which is so emphatically repeated twice more in this chapter (Leviticus 18:4; Leviticus 18:30), has only been used once before in this book. (See Leviticus 11:44.)

18:1-30 Unlawful marriages and fleshly lusts. - Here is a law against all conformity to the corrupt usages of the heathen. Also laws against incest, against brutal lusts, and barbarous idolatries; and the enforcement of these laws from the ruin of the Canaanites. God here gives moral precepts. Close and constant adherence to God's ordinances is the most effectual preservative from gross sin. The grace of God only will secure us; that grace is to be expected only in the use of the means of grace. Nor does He ever leave any to their hearts' lusts, till they have left him and his services.Speak unto the children of Israel,.... To the heads of their tribes, that they might deliver to them the following laws; or Moses is bid to publish them among them, either by word of mouth, or by writing, or both:

and say unto them, I am the Lord your God; with which they were to be introduced; showing the right he had to enact and enjoin such laws, since he was Jehovah, the Being of beings, and from whom they received their beings; their sovereign Lord and King, who had a right to rule over them, and command what he pleased; and also the obligation they lay under to him to regard them, and yield a cheerful obedience to them, since he was their God, not only that had made them, but had redeemed them out of Egypt; and who had made a covenant with them, and had taken special care of them, and had bestowed many wonderful favours on them; and for this purpose is this phrase often used in this chapter, and very frequently in the next. See Leviticus 18:2.