Psalms 117:1

There is a great deal of gospel in this psalm. The apostle has furnished us with a key to it (Rom 15:11), where he quotes it as a proof that the gospel was to be preached to, and would be entertained by, the Gentile nations, which yet was so great a stumbling-block to the Jews. Why should that offend them when it is said, and they themselves had often sung it, Praise the Lord, all you Gentiles, and laud him, all you people. Some of the Jewish writers confess that this psalm refers to the kingdom of the Messiah; nay, one of them has a fancy that it consists of two verses to signify that in the days of the Messiah God should be glorified by two sorts of people, by the Jews, according to the law of Moses, and by the Gentiles, according to the seven precepts of the sons of Noah, which yet should make one church, as these two verses make one psalm. We have here, I. The vast extent of the gospel church, Psa 117:1. For many ages in Judah only was God known and his name praised. The sons of Levi and the seed of Israel praised him, but the rest of the nations praised gods of wood and stone (Dan 5:4), while there was no devotion at all paid, at least none openly, that we know of, to the living and true God.

— Matthew Henry's Concise Commentary (public domain)