Charles H. Spurgeon on Psalms 47:3

He shall subdue the people under us, etc., or he shall lead like sheep; or bring unto to fold; as divers render the word, by comparing Isa 5:17 Mic 2:12. He seems to speak of such a subjugation of them, as was for the good of the people subdued, because this is matter of rejoicing to them, verse 1; which is true both of these people whom David subdued, who thereby had opportunities, obligations, and encouragements to own and worship the true God, which was the only way to their true and lasting happiness; and especially of those Gentiles who were subdued to Christ by the preaching of the gospel. The Gentile converts were in some sort brought under the Jews, because they were subjected to Christ and to his apostles, and to the primitive church, which were Jews. Matthew Poole.