When the wicked succeed in tempting the righteous, Vice seems to win a triumph. But the triumph is suicidal. The tempter will suffer the punishment he deserves, and the blameless, if true to themselves, will be strengthened and ennobled by the temptation.

Whoso causeth the righteous to go astray - He who strives to pervert one really converted to God, in order that he may pour contempt on religion, shall fall into that hell to which he has endeavored to lead the other.

Whoso causeth the righteous to go astray in an evil way,.... That is, who attempts to deceive them, and draw them into errors or immoralities, and so into a snare, into mischief and ruin; first into the evil of sin, in order to bring them into the evil of punishment; I say, who attempts to do it; for it is not possible that God's elect, those who are truly righteous and good, should be totally and finally deceived, Matthew 24:24;
he shall fall himself into his own pit; which he had dug and prepared for the righteous, who through the grace and goodness of God is preserved from it; the mischief intended for the good man falls upon himself in righteous, judgment, Psalm 7:15;
but the upright shall have, good things in possession; or "shall inherit good things" (h); they are heirs of God, and joint heirs with Christ, and shall inherit all things; they have all good things in Christ, with him and from him now; nor can they be taken from them, or they be caused to lose them by all the policy and craft of men and devils, who seek to draw them into sin and snares with that view; but, notwithstanding all their efforts, they shall keep possession of their good things here, the grace of the spirit, and the blessings of grace, and shall enjoy glory hereafter.
(h) "haereditate accipient bonum", Pagninus, Montanus; "haereditabunt bonum", Michaelis; so Mercerus, Cocceius; "haereditatem cernent ubertatem boni", Schultens.

The success of ungodly men is their own misery.

(Compare Proverbs 26:27).

A tristich beginning with a participle:
He who misleads the upright into an evil way,
He shall fall into his own pit;
But the innocent shall inherit that which is good.
In the first case, Proverbs 26:27 is fulfilled: the deceiver who leads astray falls himself into the destruction which he prepared for others, whether he misleads them into sin, and thus mediately prepares destruction for them, or that he does this immediately by enticing them into this or that danger; for בּדרך רע may be understood of the way of wicked conduct, as well as of the experience of evil, of being betrayed, robbed, or even murdered. That those who are misled are called ישׁרים, explains itself in the latter case: that they are such as he ought to show respect towards, and such as deserved better treatment, heightens the measure of his guilt. If we understand being morally led astray, yet may we not with Hitzig here find the "theory" which removes the punishment from the just and lays it on the wicked. The clause Proverbs 11:8 is not here applicable. The first pages of the Scripture teach that the deceiver does not by any means escape punishment; but certainly the deceiver of the upright does not gain his object, for his diabolical joy at the destruction of such an one is vain, because God again helps him with the right way, but casts the deceiver so much the deeper down. As the idea of דרך רע has a twofold direction, so the connections of the words may be genitival (via mali) as well as adjectival (via mala). בּשׁחוּתו is not incorrectly written for בּשׁוּחתו, for שׁחית occurs (only here) with שׁחוּת as its warrant both from שׁחה, to bend, to sink; cf. לזוּת under Proverbs 4:24. In line third, opposite to "he who misleads," stand "the innocent" (pious), who, far from seeking to entice others into the evil way and bring them to ruin, are unreservedly and honestly devoted to God and to that which is good; these shall inherit good (cf. Proverbs 3:35); even the consciousness of having made no man unhappy makes them happy; but even in their external relations there falls to them the possession of all good, which is the divinely ordained reward of the good.

Causeth - That by evil counsel, or example, or artifice, draws them into evil.