So the poor hath hope - From the interposition of God. They are not left in a sad and comfortless condition. They are permitted to regard God as their protector and friend, and to look forward to another and a better world. This sentiment accords with all that is elsewhere said in the Scriptures, that the offers of mercy are specially made to the poor, and that they are especially the objects of the divine compassion.
And iniquity stoppeth her mouth - That is, the wicked are confounded when they see all their plans foiled, and find themselves entangled in the snares which they have laid for others. A similar sentiment occurs in Psalm 107:41-42 :
Yet setteth he the poor on high from affliction,
And maketh him families like a flock.
The righteous shall see it and rejoice,
And all iniquity shall stop her mouth."
It is to be remembered that Eliphaz states this as the result of his own observation, and as clearly demonstrating in his view that there is a superintending and overruling Providence. A careful observation of the course of events would lead undoubtedly to the same conclusion, and this has been embodied in almost every language by some proverbial sentiment. We express it by saying that "honesty is the best policy;" a proverb that is undoubtcdly founded in wisdom. The sentiment is, that if a man wishes long to prosper, he should pursue a straight-forward and an honest course; that cunning, intrigue, underhanded dealing, and mere management, will sooner or later defeat itself, and recoil on the head of him who uses it; and that, therefore, if there were no higher motive than self-interest, a man should be honest, frank, and open. See this argument stated at greater length, and with great beauty, in Ps. 37.

So the poor - דל dal, he who is made thin, who is wasted, extenuated; hath hope - he sees what God is accustomed to do, and he expects a repetition of gracious dealings in his own behalf; and because God deals thus with those who trust in him, therefore the mouth of impiety is stopped. Religion is kept alive in the earth, because of God's signal interventions in behalf of the bodies and souls of his followers.

So the poor hath hope, and iniquity (r) stoppeth her mouth.
(r) If the wicked are compelled by God's works to shut their mouths, how much more they who profess God.

So the poor hath hope,.... Who observing this and that and the other poor man crying to the Lord and saved, hopes that he may be saved by him also; and having had experience of salvation out of one trouble or more, even out of six troubles, as in Job 5:19, entertains a comfortable hope he shall be saved out of the seventh, or whatsoever he is in: the word (y) used signifies one that is weak and feeble, attenuated, and exhausted of his strength, wealth, and substance; and may be applied to one spiritually poor, and in a very destitute and forlorn condition in himself; and yet, through the revelation of the grace and mercy of God to him, has hope of safety in Christ, the strong hold and hope set before him to flee unto; and of salvation by him, it being in him, and for the chief of sinners, and altogether free; and of eternal life through him, as being promised of God, that cannot lie: the free gift of God through Christ, and in his hands to dispose of:
and iniquity stoppeth her mouth: that is, iniquitous men: very wicked men, who are iniquity and wickedness itself; these shall stop their mouths, through shame at what they have said concerning the poor that God saves, see Micah 7:9; and through admiration at the goodness of God in saving them, Isaiah 52:15; having nothing to say against the ways and dispensations of Divine Providence, they are apt to quarrel with, Psalm 107:40; and especially at the last day such shall have their mouths stopped, and shall not be able to open them against the Lord or his people, being convinced of their hard speeches which they have spoken against them, Jde 1:15; and will be like the man at the feast without a wedding garment, speechless, or muzzled, and his mouth stopped, Matthew 22:12.
(y) "tenai", Montanus, Vatablus, Junius, Tremellius, Piscator, Cocceius.

the poor hath hope--of the interposition of God.
iniquity stoppeth her mouth-- (Psalm 107:42; Micah 7:9-10; Isaiah 52:15). Especially at the last day, through shame (Jde 1:15; Matthew 22:12). The "mouth" was the offender (Job 5:15), and the mouth shall then be stopped (Isaiah 25:8) at the end.

So - So he obtains what he hoped for from God, to whom he committed his cause. Iniquity - Wicked men. Stoppeth - They are silenced and confounded, finding that not only the poor are got out of their snares, but the oppressors themselves are ensnared in them.