He shall not be rich - That is, he shall not continue rich; or he shall not again become rich. He shall be permanently poor.

Neither shall his substance continue - His property.

Neither shall he prolong the perfection thereof - Noyes renders this, "And his possessions shall not be extended upon the earth." Wemyss, "Nor shall he be master of his own desires." Good, "Nor their success spread abroad in the land." Luther, Und sein Gluck wird sich nicht ausbreiten im Lande - " And his fortune shall not spread itself abroad in the land." Vulgate, "Neither shall he send his root in the earth " - nec mittet in terra radicem suam. The Septuagint, οὐ μὴ βάλῃ ἐπὶ τὴν γῆν σκιὰν ou mē balē epi tēn gōn skian - "and shall not cast a shadow upon the earth." The word rendered "perfection" (מנלם mı̂nlām) is commonly supposed to be from מנלה mı̂nleh, from נלה nâlâh to finish, to procure, and hence, the noun may be applied to that which is procured - and thus may denote possessions. According to this the correct rendering is, "and he does not extend their possessions abroad in the land;" that is, his possessions do not extend abroad. Gesenius supposes, however, that the word is a corruption for מבלם - "their flocks." I see no objection, however, to its being regarded as meaning possessions - and then the sense is, that he would fail in that which is so much the object of ambition with every avaricious man - that his possessions should extend through the land; compare the notes at Isaiah 5:8.

Job 15:29 Parallel Commentaries

Meditations to Stir us up to Morning Prayer.
1. If, when thou art about to pray, Satan shall suggest that thy prayers are too long, and that therefore it were better either to omit prayers, or else to cut them shorter, meditate that prayer is thy spiritual sacrifice, wherewith God is well pleased (Heb. xiii. 15, 16;) and therefore it is so displeasing to the devil, and so irksome to the flesh. Bend therefore thy affections (will they, nill they) to so holy an exercise; assuring thyself, that it doth by so much the more please God, by how much …
Lewis Bayly—The Practice of Piety

The Hebrew Sages and their Proverbs
[Sidenote: Role of the sages in Israel's life] In the days of Jeremiah and Ezekiel (Jer. xviii. 18; Ezek. vii. 26) three distinct classes of religious teachers were recognized by the people: the prophets, the priests, and the wise men or sages. From their lips and pens have come practically all the writings of the Old Testament. Of these three classes the wise men or sages are far less prominent or well known. They wrote no history of Israel, they preached no public sermons, nor do they appear …
Charles Foster Kent—The Origin & Permanent Value of the Old Testament

Man's Inability to Keep the Moral Law
Is any man able perfectly to keep the commandments of God? No mere man, since the fall, is able in this life perfectly to keep the commandments of God, but does daily break them, in thought, word, and deed. In many things we offend all.' James 3: 2. Man in his primitive state of innocence, was endowed with ability to keep the whole moral law. He had rectitude of mind, sanctity of will, and perfection of power. He had the copy of God's law written on his heart; no sooner did God command but he obeyed. …
Thomas Watson—The Ten Commandments