God is, and always has been, the God of Abraham, Isaac and Jacob. But here He claims He will be God for those who are not blood descendants of Jacob (Israel).
He calls the fugitives from the nations to an assembly. He invites them to turn to Him, not the idols of this world, and be saved. What a precious invitation!
No longer do you have to be a descendant of Jacob to be God's chosen person. You can be anyone, from anywhere. God's arms are open to all.
It is the precursor of another verse.
For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life. John 3:16 KJV
Whosoever... Whosoever can be replaced by any name in the world. Annie, Bob, Carl, David, Elizabeth, Frank, Genevieve, Harriet, Irene, John, Kenneth, Larry, Martin, Nathan, Olivia, Pearl, Quinton, Ralph, Sarah, Tess, Ursula, Victor, Wendy, Xavier, Yvonne, Zelda.
When we turn to God, our knees bow in adoration. But this passage also says that every knee, not just those who turn to Him, will bow. Can you imagine the consternation of not having turned to the Lord and ultimately finding yourself in the position of bowing to him in terror?
Let us resolve to be ambassadors and evangelists so that the number of trembling, terrified knees is lessened and the number of adoring knees is increased.
Help us to reflect Your light to this darkened world. Let us be beacons, leading the lost to You. Grant us the gentleness and tenderness to woo them into Your kingdom.
In Jesus' most precious name.