God created Israel for His glory and He will not give his glory to another nation. He will not give His glory to another nation since they serve idols and that would be effectively giving his glory to other gods/idols. Israel was His glory and giving His glory to another nation would profane His name since it would demonstrate failure on his part since it was Israel which He created for His glory. He was Israel's God and the gods of the nations were other gods.

WRONG: "I will not give My glory to another [besides Me]."

RIGHT: "I will not give My glory to another [besides Israel]"

For the Lord has redeemed Jacob, and will be GLORIFIED in Israel. Isaiah 44:23.

You are my servant, Israel, IN WHOM I will be GLORIFIED. Isaiah 49:3.

They are Israelites, and to them belong the sonship, THE GLORY the covenants, the giving of the law, the worship, and the promises. Romans 9:4.

Behold, you shall call nations that you know not, and nations that knew you not shall run to you, because of the Lord your God, and of the Holy One of Israel, for He has GLORIFIED YOU. Isaiah 55:5

Arise, shine; for your light has come, and the glory of the LORD has risen upon you.... No longer will you have the sun for light by day, nor for brightness will the moon give you light; But you will have the LORD for an everlasting light, And your God for your GLORY. Isaiah 60:1,19.

But now, thus says Yahweh, your Creator, O Jacob, And He who formed you, O Israel, "Do not fear, for I have redeemed you; I have called you by name; you are Mine!... Everyone who is called by My name, and whom I have created for My GLORY, whom I have formed, also whom I have made." Isaiah 43:1-7

I will put salvation in Zion, to Israel My GLORY. Isaiah 46:13.

I will not give My GLORY to another. Isaiah 42:8