All the ends of the earth have seen the salvation of our God. (Psalm 98:3b)
God could have done a quiet work of salvation, He did after all, chose a small, even insignificant, people, in a remote part of the planet. They had many huge and notable empires nearby: Egyptians, Babylonians, Persians, Greeks, Romans, etc. But there was tiny Israel, always with another conqueror breezing through, and making them a (remote and inconsequential) part of an “intergalactic” empire. But one of the reasons God chose a small people was to ensure that they would never (try though they must) get the credit for their salvation. This salvation was very much a God-thing, and must not be confused for anything else. So when All the ends of the earth have seen the salvation of our God, they were seeing the salvation of our God.
Now the question needs to be asked: Why? If this was an “Israel only” to-do, why should all the earth see it.
Well, Israel may have been God’s Chosen people, but all earth’s peoples were made by Him—all had His image stamped upon them.
There were those who were aliens who would recognize that the God of Israel was indeed the Lord of all. In the context of this Psalm, it was because they had seen the salvation of our God.
The stranger who resides with you shall be to you as the native among you, and you shall love him as yourself, for you were aliens in the land of Egypt; I am the LORD your God. ( Lev 19:34)
So show your love for the alien, for you were aliens in the land of Egypt. (Deuteronomy 10:19)
God had spoken to Israel on many occasions, reminding them they too were aliens; Perhaps the greatest thing about the New Covenant—all of us aliens can now draw close to the Lord God through the shed blood of Jesus.
But now in Christ Jesus you who formerly were far off have been brought near by the blood of Christ. (Ephesians 2:13)
After all, We have an Advocate with the Father, Jesus Christ the righteous; and He Himself is the propitiation for our sins; and not for ours only, but also for those of the whole world. (1 John 2:2)