Teach them - The Hebrew word is emphatic, and signifies "enlightenment." The text gives four distinct points:

(a) the "ordinances," or specific enactments,

(b) "the laws," or general regulations,

(c) "the way," the general course of duty,

(d) "the works," each specific act.

Thou shalt teach them ordinances - חקים chukkim, all such precepts as relate to the ceremonies of religion and political economy. And laws, התורת hattoroth, the instructions relative to the whole system of morality.

And shalt show them the way - אה הדרך eth hadderech, That very Way, that only way, which God himself has revealed, and in which they should walk in order to please him, and get their souls everlastingly saved.

And the work that they must do - For it was not sufficient that they should know their duty both to God and man, but they must Do it too; יעשון yaasun, they must do it diligently, fervently, effectually; for the paragogic nun deepens and extends the meaning of the verb.

What a very comprehensive form of a preacher's duty does this verse exhibit! 1. He must instruct the people in the nature, use, and importance of the ordinances of religion. 2. He must lay before them the whole moral law, and their obligations to fulfill all its precepts. 3. He must point out to each his particular duty, and what is expected of him in his situation, connections, etc. And, 4. He must set them all their work, and see that they do it. On such a plan as this he will have full opportunity to show the people, 1. Their sin, ignorance, and folly; 2. The pure and holy law which they have broken, and by which they are condemned; 3. The grace of God that bringeth salvation, by which they are to be justified and finally saved; and, 4. The necessity of showing their faith by their works; not only denying ungodliness and worldly lusts, but living soberly, righteously, and godly in this present world, looking for that blessed hope, and the glorious appearing of the great God and our Savior, Jesus Christ.

And thou shalt teach them ordinances and laws,.... Both with respect to things civil and religious, which he should receive from God:

and shalt show them the way wherein they must walk; the path of faith and duty, the way of truth, holiness, and righteousness:

and the work that they must do; both with respect to God, and one another, the various duties and exercises of religion, everything relating to their moral, religious, and civil conduct.

And thou shalt teach them ordinances and laws, and shalt show them the way wherein they must walk, and the work that they must do.

18:13-27 Here is the great zeal and the toil of Moses as a magistrate. Having been employed to redeem Israel out of the house of bondage, he is a further type of Christ, that he is employed as a lawgiver and a judge among them. If the people were as quarrelsome one with another as they were with God, no doubt Moses had many causes brought before him. This business Moses was called to; it appears that he did it with great care and kindness. The meanest Israelite was welcome to bring his cause before him. Moses kept to his business from morning to night. Jethro thought it was too much for him to undertake alone; also it would make the administration of justice tiresome to the people. There may be over-doing even in well-doing. Wisdom is profitable to direct, that we may neither content ourselves with less than our duty, nor task ourselves beyond our strength. Jethro advised Moses to a better plan. Great men should not only study to be useful themselves, but contrive to make others useful. Care must be taken in the choice of the persons admitted into such a trust. They should be men of good sense, that understood business, and that would not be daunted by frowns or clamours, but abhorred the thought of a bribe. Men of piety and religion; such as fear God, who dare not to do a base thing, though they could do it secretly and securely. The fear of God will best fortify a man against temptations to injustice. Moses did not despise this advice. Those are not wise, who think themselves too wise to be counselled.