Isaiah 45:17

But Israel shall be saved in the LORD with an everlasting salvation: ye shall not be ashamed nor confounded world without end.

But Israel shall be saved in the Lord,.... Not the carnal seed of Israel, or the natural posterity of Jacob, for only a remnant of them were saved; indeed, in the latter day, when there will be a general conversion of them, there will be a general salvation of them,

all Israel shall be saved; but here the spiritual Israel of God are meant, such as God has appointed unto salvation; who are taken into the covenant of his grace, in which their salvation is secured; who are his spiritual people, whom Christ saves from their sins; who are redeemed by the blood of Christ, and are called by his grace; who believe in him, and hope in the Lord: these "shall be saved": there is a certainty of their salvation, and not a mere probability and possibility of it only. It is not they "may be", but they "shall be" saved; it is the will of God they should, whose will cannot be resisted; they are the purchase of Christ, which he will never lose, and the Spirit is the earnest and pledge of salvation to them: and it is "in" and "by the Lord" they are saved, not in of themselves; their destruction is of themselves, but their salvation is of the Lord; and they are saved as they are in him, and owing to their being in him; they are chosen in him, and hence spring all the blessings of grace and salvation to them; they are representatively in him, as their federal Head; they are openly in him, in effectual calling; and they are justified in him, and by his righteousness, and so saved; and being in him, there is no condemnation to them, nor can they ever come into it. They are saved "by" the Lord; by the Word of the Lord, as the Targum; by Jesus Christ, the incarnate Word; by his obedience, sufferings, and death; by his blood, righteousness, and sacrifice; and by his interceding life, and that "with an everlasting salvation"; which is distinguished, by this epithet, from a temporal one, and is opposed to eternal damnation, the desert of sin; it is the salvation of the immortal soul, and includes in it grace and glory, which are perpetual and everlasting; and the duration of it is owing to the perpetuity of Christ's person, office, and grace: or, "with a salvation of ages", or "worlds" {a}:

ye shall not be ashamed, nor confounded, world without end; or, "unto the ages of eternity" {b}; that is, such who believe in Christ, and are saved by him, they shall not be ashamed, though the makers and worshippers of idols will; they shall not be confounded, neither in this world, nor in the other; they shall not be ashamed of Christ, his word, and ordinances, nor of their faith and hope in him, or of their sufferings for him; they shall not be ashamed in the resurrection morn, their vile bodies being fashioned like to the glorious body of Christ, when others shall rise to shame and everlasting contempt; nor shall they be ashamed at the coming of Christ, and when they stand before him, being clothed with white robes, and having on the wedding garment; when they shall be introduced into his own and his Father's kingdom and glory, into the world of happiness, which will know no end.

{a} Mymlwe tewvt "salute Seculorum", Pagninus, Montanus, Vatublus; "salvatione seculorum", Cocceius. So Ben Melcch interprets it, this world and the world to come; everlasting salvation takes in both.
{b} de ymlwe de "in secula perpetuitatis", Montanus, Vatablus.