To hear the groaning of the prisoner Here the prophet repeats once more what he had previously touched upon concerning prayer, in order again to stir up the hearts of the godly to engage in that exercise, and that after their deliverance they might know it to have been granted to their faith, because, depending on the divine promises, they had sent up their groanings to heaven. He calls them prisoners; for although they were not bound in fetters, their captivity resembled a most rigorous imprisonment. Yea, he affirms a little after that they were devoted to death, to give them to understand that their life and safety would have been altogether hopeless, had they not been delivered from death by the extraordinary power of God.

To hear the groaning of the prisoner - Meaning here, probably, the captives in Babylon; those who were held as prisoners there, and who were subjected to such hardships in their long captivity. See the notes at Psalm 79:11.
To loose those that are appointed to death - Margin, as in Hebrew, "the children of death." Compare the notes at Matthew 1:1. This may mean either those who were sentenced to death; those who were sick and ready to die; or those who, in their captivity, were in such a state of privation and suffering that death appeared inevitable. The word rendered "loose" means, properly, to "open," applied to the mouth, for eating, Ezekiel 3:2; or in song, Psalm 78:2; or for speaking, Job 3:1; - or the ear, Isaiah 50:5; or the hand, Deuteronomy 15:8; or the gates of a city, a door, etc., Deuteronomy 20:11. Them it means to set free, as by opening the doors of a prison, Isaiah 14:17; Job 12:14. Here it means to "set free," to deliver. Compare Isaiah 61:1.

To hear the groaning - By sin, all the inhabitants of the earth are miserable. They have broken the Divine laws, are under the arrest of judgment, and all cast into prison, They have been tried, found guilty, and appointed to die; they groan under their chains, are alarmed at the prospect of death, and implore mercy.

To hear the groaning of the prisoner; to loose those that are (o) appointed to death;
(o) Who now in their banishment could look for nothing but death.

To hear the groanings of the prisoner,.... Not of a single person only, but of many, who lie in prisons in Popish countries, especially in the Inquisition; where they lie and groan, in darkness and misery, under dreadful tortures; their cries and groans the Lord hears; his heart yearns towards them; he looks with pity on them; and, because of the sighing of these poor and needy ones, he will arise in due time, and set them in safety from him that puffs at them: it is true also of such who are prisoners of sin, Satan, and the law; and, when sensible of it, groan under their bondage, and cry to the Lord for help, who hears them, and directs them, as prisoners of hope, to turn to Christ, their strong hold, Zac 9:11,
to loose those that are appointed to death; delivered to death, as the Targum; delivered over to the secular power, in order to be put to death; who are arraigned and condemned as malefactors, and put into the condemned hole, in order for execution; these the Lord will loose, and save them from the death they are appointed to by men; for this is not to be understood of persons appointed by the Lord to death, either corporeal or eternal, from which none can be loosed, so appointed: in the original text the phrase is "children of death" (d); the same as "children of wrath", Ephesians 2:3, that is, deserving of death, and under the sentence of it; as all men are in Adam, even the Lord's own people; and who are, in their own apprehension, as dead men, when awakened and convinced of their state by the Spirit of God; these Christ looses from the shackles and fetters of sin, from the bondage of the law, from the tyranny of Satan, and from fears of death, and puts them into the glorious liberty of the children of God.
(d) "filios mortis", Montanus, Vatablus, Musculus, Gejerus, Michaelis.

To loose - To release his poor captives out of Babylon, and from the chains of sin and eternal destruction.