Salvation belongs unto the LORD: your blessing is upon your people. Selah.
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Augustine of Hippo
8. "Salvation is of the Lord; and upon Thy people be Thy blessing" (ver. 8). In one sentence the Psalmist has enjoined men what to believe, and has prayed for believers. For when it is said, "Salvation is of the Lord," the words are addressed to men. Nor does it follow, "And upon Thy people" be "Thy blessing," in such wise as that the whole is spoken to men, but there is a change into prayer addressed to God Himself, for the very people to whom it was said, "Salvation is of the Lord." What else then doth he say but this? Let no man presume on himself, seeing that it is of the Lord to save from the death of sin; for, "Wretched man that I am, who shall deliver me from the body of this death? The grace of God through Jesus Christ our Lord." But do Thou, O Lord, bless Thy people, who look for salvation from Thee.
9. This Psalm can be taken as in the Person of Christ another way; which is that whole Christ should speak. I mean by whole, with His body, of which He is the Head, according t...
Blessing. Abundance of grace is promised to God's servants, who must look up to him for salvation. David gives thanks for the victory, though he grieved at his son's death. (Worthington)
He showed proofs of the greatest clemency on this occasion. It is evident, from this psalm being inserted before many which regard Saul, that no chronological order is observed. (Calmet)
Selah occurs a third time here, as some may have ended the lecture at one, while others ordered it to be continued to another, or even to the 3rd or 5th verse of the next psalm, if that be its real import. (Haydock) ...