Charles H. Spurgeon on Psalms 47:9

The people of the God of Abraham. First, touching the God of Abraham, it is Christ, whose day Abraham desired to see, and in seeing whereof he did so much rejoice Joh 8:1-59; that is, not only the day of his birth, which he saw, as we learn by the oath which he caused his servant to take Ge 24:1-67 but also the day of his passion, which he saw long ago, and rejoiced in seeing it, when he said to his son Isaac in the mount, "The Lord will provide a sacrifice." Ge 22:8. Secondly, The people of the God of Abraham, are his children and posterity: not only that they are the seed of Abraham, coming out of his loins, and are "the children of the flesh" Ro 9:9; but "the children of the promise; "for if they that come out of Abraham's loins were only his children, then the Hagarins, the Turks, and Ishmaelites should be the people of God; "But in Isaac shall thy seed be called." They that lay hold of the promise by faith, "They that are of the faith, are the children of Abraham" Ga 3:7, that have the same spirit of faith that Abraham had. As the apostle saith Ro 2:28, "He is not a Jew that is one outwardly, but a Jew inwardly is the true Jew." They that worship the Messias by believing in him with the faith of Abraham, they are Abraham's children, and the people of Abraham's God, which thing John Baptist affirms Mt 3:1-17, "God can of stones raise up children unto Abraham." So the Gentiles, which worshipped stones, and therefore were "like unto them" Ps 115:1-18, were notwithstanding raised up to be children to Abraham. Lancelot Andrewes.