Ye shall therefore keep my statutes, and my judgments: which if a man do, he shall live in them: {b} I am the LORD.

(b) And therefore you ought to serve me alone, as my people.

Wesley's Notes

18:5 He shall live in them - Not only happily here, but eternally hereafter. This is added as a powerful argument why they should follow God's commands, rather than mens examples, because their life and happiness depend upon it. And though in strictness, and according to the covenant of works they could not challenge life for so doing, except their obedience was universal, perfect, constant and perpetual, and therefore no man since the fall could be justified by the law, yet by the covenant of grace this life is promised to all that obey God's commands sincerely.

Jamieson-Fausset-Brown Bible Commentary

5. Ye shall therefore keep my statutes, and my judgments: which if a man do, he shall live in them-A special blessing was promised to the Israelites on condition of their obedience to the divine law; and this promise was remarkably verified at particular eras of their history, when pure and undefiled religion prevailed among them, in the public prosperity and domestic happiness enjoyed by them as a people. Obedience to the divine law always, indeed, ensures temporal advantages; and this, doubtless, was the primary meaning of the words, "which if a man do, he shall live in them." But that they had a higher reference to spiritual life is evident from the application made of them by our Lord (Lu 10:28) and the apostle (Ro 10:2).

Matthew Henry's Concise Commentary

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.

Matthew Henry's Whole Bible Commentary

Chapter 18

Here is, I. A general law against all conformity to the corrupt usages of the heathen (v. 1-5). II. Particular laws, 1. Against incest (v. 6-18). 2. Against beastly lusts, and barbarous idolatries (v. 19-23). III. The enforcement of these laws from the ruin of the Canaanites (v. 24-30).

Verses 1-5

After divers ceremonial institutions, God here returns to the enforcement of moral precepts. The former are still of use to us as types, the latter still binding as laws. We have here, 1. The sacred authority by which these laws are enacted: I am the Lord your God (v. 1, 4, 30), and I am the Lord, v. 5, 6, 21. "The Lord, who has a right to rule all; your God, who has a peculiar right to rule you." Jehovah is the fountain of being, and therefore the fountain of power, whose we are, whom we are bound to serve, and who is able to punish all disobedience. "Your God to whom you have consented, in whom you are happy, to whom you lie under the highest obligations imaginable, and to whom you are accountable." 2. A strict caution to take heed of retaining the relics of the idolatries of Egypt, where they had dwelt, and of receiving the infection of the idolatries of Canaan, whither they were now going, v. 3. Now that God was by Moses teaching them his ordinances there was aliquid dediscendum-something to be unlearned, which they had sucked in with their milk in Egypt, a country noted for idolatry: You shall not do after the doings of the land of Egypt. It would be the greatest absurdity in itself to retain such an affection for their house of bondage as to be governed in their devotions by the usages of it, and the greatest ingratitude to God, who had so wonderfully and graciously delivered them. Nay, as if governed by a spirit of contradiction, they would be in danger, even after they had received these ordinances of God, of admitting the wicked usages of the Canaanites and of inheriting their vices with their land. Of this danger they are here warned, You shall not walk in their ordinances. Such a tyrant is custom that their practices are called ordinances, and they became rivals even with God's ordinances, and God's professing people were in danger of receiving law from them. 3. A solemn charge to them to keep God's judgments, statutes, and ordinances, v. 4, 5. To this charge, and many similar ones, David seems to refer in the many prayers and professions he makes relating to God's laws in the 119th Psalm. Observe here, (1.) The great rule of our obedience-God's statutes and judgments. These we must keep to walk therein. We must keep them in our books, and keep them in our hands, that we may practise them in our hearts and lives. Remember God's commandments to do them, Ps. 103:18. We must keep in them as our way to travel in, keep to them as our rule to work by, keep them as our treasure, as the apple of our eye, with the utmost care and value. (2.) The great advantage of our obedience: Which if a man do, he shall live in them, that is, "he shall be happy here and hereafter." We have reason to thank God, [1.] That this is still in force as a promise, with a very favourable construction of the condition. If we keep God's commandments in sincerity, though we come short of sinless perfection, we shall find that the way of duty is the way of comfort, and will be the way to happiness. Godliness has the promise of life, 1 Tim. 4:8. Wisdom has said, Keep my commandments and live: and if through the Spirit we mortify the deeds of the body (which are to us as the usages of Egypt were to Israel) we shall live. [2.] That it is not so in force in the nature of a covenant as that the least transgression shall for ever exclude us from this life. The apostle quotes this twice as opposite to the faith which the gospel reveals. It is the description of the righteousness which is by the law, the man that doeth them shall live ev autois-in them (Rom. 10:5), and is urged to prove that the law is not of faith, Gal. 3:12. The alteration which the gospel has made is in the last word: still the man that does them shall live, but not live in them; for the law could not give life, because we could not perfectly keep it; it was weak through the flesh, not in itself; but now the man that does them shall live by the faith of the Son of God. He shall owe his life to the grace of Christ, and not to the merit of his own works; see Gal. 3:21, 22. The just shall live, but they shall live by faith, by virtue of their union with Christ, who is their life.