Exodus 18:17-22

Verse 18

Thou wilt surely wear away - נבל תבל nabol tibbol, in wearing way, thou wilt wear away - by being thus continually employed, thou wilt soon become finally exhausted. And this people that is with thee; as if he had said, "Many of them are obliged to wait so long for the determination of their suit that their patience must be soon necessarily worn out, as there is no one to hear every cause but thyself."
Verse 19

I will give thee counsel, and God shall be with thee - Jethro seems to have been a man of great understanding and prudence. His advice to Moses was most appropriate and excellent; and it was probably given under the immediate inspiration of God, for after such sacrificial rites, and public acknowledgment of God, the prophetic spirit might be well expected to descend and rest upon him. God could have showed Moses the propriety and necessity of adopting such measures before, but he chose in this case to help man by man, and in the present instance a permanent basis was laid to consolidate the union of the two families, and prevent all future misunderstandings.
Verse 20

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.
Verse 21

Able men - Persons of wisdom, discernment, judgment, prudence, and fortitude; for who can be a ruler without these qualifications? Such as fear God - Who are truly religious, without which they will feel little concerned either for the bodies or souls of the people.

Men of truth - Honest and true in their own hearts and lives; speaking the truth, and judging according to the truth.

Hating covetousness - Doing all for God's sake, and love to man; laboring to promote the general good; never perverting judgment, or suppressing the testimonies of God, for the love of money or through a base, man-pleasing spirit, but expecting their reward from the mercy of God in the resurrection of the just.

Rulers of thousands, etc. - Millenaries, centurions, quinquagenaries, and decurions; each of these, in all probability, dependent on that officer immediately above himself. So the decurion, or ruler over ten, if he found a matter too hard for him, brought it to the quinquagenary, or ruler of fifty; if, in the course of the exercise of his functions, he found a cause too complicated for him to decide on, he brought it to the centurion, or ruler over a hundred. In like manner the centurion brought his difficult case to the millenary, or ruler over a thousand; the case that was too hard for him to judge, he brought to Moses; and the case that was too hard for Moses, he brought immediately to God. It is likely that each of these classes had a court composed of its own members, in which causes were heard and tried. Some of the rabbins have supposed that there were 600 rulers of thousands, 6000 rulers of hundreds, 12,000 rulers of fifties and 60,000 rulers of tens; making in the whole 78,600 officers. But Josephus says (Antiq., lib. iii., chap. 4) that Moses, by the advice of Jethro, appointed rulers over myriads, and then over thousands; these he divided into five hundreds, and again into hundreds, and into fifties; and appointed rulers over each of these, who divided them into thirties, and at last into twenties and tens; that each of these companies had a chief, who took his name from the number of persons who were under his direction and government. Allowing what Josephus states to be correct, some have supposed that there could not have been less than 129,860 officers in the Israelitish camp. But such computations are either fanciful or absurd. That the people were divided into thousands, hundreds, fifties and tens, we know, for the text states it, but we cannot tell precisely how many of such divisions there were, nor, consequently, the number of officers.
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