In the LORD shall all the seed of Israel be justified, and shall glory.
All the seed of Israel - the spiritual Israel (Romans 2:29) and the literal Israel - i:e., the final remnant which shall all be saved (Isaiah 45:17; Romans 11:26).
Be justified - treated as if they were just, through Christ's righteousness and death (Jeremiah 23:5).
And shall glory ( yithalluw (H1984)) - literally, sing in His praise (Jeremiah 9:24; 1 Corinthians 1:31).
Remarks: Cyrus is a striking type of Messiah, the Anointed One of God. For the sake of Israel, the elect servant of Yahweh, Cyrus was "called" by God, and his "right hand" was upholden, so that the nations were 'subdued before him,' and the gates of mighty Babylon 'opened before him.' So Yahweh made "the crooked places straight" before Messiah, and burst open for Him the gates of death, and gave Him "the treasures" which Satan the strong man had long kept in his house of "darkness." But the antitype always exceeds the type. Cyrus knew not God when God called him by name. But Messiah has been from eternity with God, "rejoicing always before Him." The effect of God's designation of Messiah to be the Saviour of mankind shall be ultimately that which the designation of Cyrus to be deliverer of the Jews effected only in part, "from the rising of the sun, and from the west," all shall know that there is "no God besides" Yahweh.