Deuteronomy 32:43

Rejoice, O ye nations, with his people.[9] — This is cited by St. Paul to show that the Gentiles must also “glorify God for His mercy” in sending Jesus Christ. But it is not wholly fulfilled yet. “If the fall of God’s people was the wealth of the world... what will the receiving of them be. but life from the dead?” (See Romans 11:12; Romans 11:15; Romans 15:10.)

[9] The LXX. have a longer version of this verse, “Rejoice, ye heavens, with Him, and let all the angels of God worship Him (Hebrews 1:7); Rejoice, ye Gentiles, with His people, and let all the sons of God be strong in Him; for,” &c.

And will be merciful unto. — Literally, will reconcile or make atonement for His land, the land of His people, or for the land of His people. He will cleanse, forgive, and be merciful to it. The very last words speak of local restoration of the land to the people, and the people to the land. Of no other land has He said “The land is mine” “Israel” alone is called His “firstborn.”