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Isaiah 45:17,24
But Israel shall be saved in the LORD with an everlasting salvation: ye shall not be ashamed nor confounded world without end…

Acts 13:39
And by him all that believe are justified from all things, from which ye could not be justified by the law of Moses.

Romans 3:24,25
Being justified freely by his grace through the redemption that is in Christ Jesus: …

the seed

Isaiah 45:19
I have not spoken in secret, in a dark place of the earth: I said not unto the seed of Jacob, Seek ye me in vain: I the LORD speak righteousness, I declare things that are right.

Isaiah 61:9
And their seed shall be known among the Gentiles, and their offspring among the people: all that see them shall acknowledge them, that theyare the seedwhich the LORD hath blessed.

Isaiah 64:9
Be not wroth very sore, O LORD, neither remember iniquity for ever: behold, see, we beseech thee, weare all thy people.

glory

Isaiah 41:16
Thou shalt fan them, and the wind shall carry them away, and the whirlwind shall scatter them: and thou shalt rejoice in the LORD,and shalt glory in the Holy One of Israel.

Psalm 64:10
The righteous shall be glad in the LORD, and shall trust in him; and all the upright in heart shall glory.

Jeremiah 9:23,24
Thus saith the LORD, Let not the wiseman glory in his wisdom, neither let the mightyman glory in his might, let not the richman glory in his riches: …

all descendants of Israel
This refers to the collective people of Israel, the chosen nation through whom God revealed His law and promises. Historically, Israel's identity is rooted in the patriarchs—Abraham, Isaac, and Jacob—and their covenant relationship with God. This phrase can also be seen as inclusive of both physical descendants and spiritual descendants, those who share the faith of Abraham (Romans 9:6-8). It foreshadows the New Testament teaching that true Israel includes all who have faith in Christ, Jew and Gentile alike (Galatians 3:29).

will be justified
Justification is a legal term meaning to be declared righteous. In the Old Testament context, it involves being in right standing with God, often through adherence to the law and sacrificial system. However, this prophecy points to a future justification that is fully realized in the New Testament through Jesus Christ, who fulfills the law and offers His righteousness to believers (Romans 3:21-26). This anticipates the doctrine of justification by faith, central to Christian theology.

and will exult
Exultation is a response of joy and triumph. For Israel, this would mean rejoicing in their restored relationship with God and the fulfillment of His promises. Culturally, exultation often accompanied deliverance and victory, as seen in the songs of Moses and Miriam after the Exodus (Exodus 15). Prophetically, this points to the ultimate joy found in salvation through Christ, as believers rejoice in the hope and assurance of eternal life (Philippians 4:4).

- The promise begins with location: salvation is “in the LORD,” not in human effort, idols, or national pride (Isaiah 45:22).

- Throughout Scripture, righteousness is tied to God’s own character: “The LORD Our Righteousness” (Jeremiah 23:6).

- Union with Him is key: “God made Him who knew no sin to be sin for us, so that in Him we might become the righteousness of God” (2 Corinthians 5:21).

- Any hope for Israel—or anyone—stands or falls on personal reliance upon the LORD Himself.

- God addresses the physical lineage of Abraham, affirming His covenant faithfulness (Genesis 17:7).

- Yet Paul shows the promise’s widening embrace: “All Israel will be saved” (Romans 11:26) and “those who have faith are sons of Abraham” (Galatians 3:7).

- The phrase therefore includes both the future national restoration and all who share Abraham’s faith, without cancelling either aspect (Jeremiah 31:33).

- To be “justified” is to be declared righteous by God’s own verdict. Isaiah’s hearers would have thought of the courtroom, where God acquits the guilty because He provides righteousness.

- The New Testament applies this directly to the work of Christ: “All are justified freely by His grace through the redemption that is in Christ Jesus” (Romans 3:21-24).

- Faith, not works, secures this standing: “found in Him… through faith in Christ” (Philippians 3:9).

- The word is future-oriented—God guarantees a coming day when every descendant who trusts Him will stand righteous before Him, vindicating His covenant promises.

- Justification naturally overflows in joy: “I will rejoice greatly in the LORD, my soul will exult in my God” (Isaiah 61:10).

- Joy crowns salvation: “We also rejoice in God through our Lord Jesus Christ, through whom we have now received reconciliation” (Romans 5:11).

- The praise is communal: “Let Israel rejoice in their Maker; let the children of Zion rejoice in their King” (Psalm 149:2).

- God’s plan ends not in mere acquittal but in celebration—His people revel in His goodness, displaying the glory of His grace to the world.

Isaiah 45:25 anchors salvation “in the LORD,” promises it to “all descendants of Israel,” assures they “will be justified,” and envisions their endless joy as they “will exult.” The verse holds together God’s faithfulness to Israel, the necessity of faith, the certainty of divine righteousness credited to believers, and the overflow of exuberant praise. God’s covenant ends not with a verdict alone, but with a song.

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