Salvation [belongeth] unto the Lord,.... As the author of it; temporal salvation is of him; all the deliverances of the saints out of their troubles are from him; and to him is owing their spiritual and eternal salvation; this belongs to Jehovah, Father, Son, and Spirit: Jehovah the Father resolved upon it, chose men to it from everlasting, contrived the scheme of it in his infinite wisdom, made a covenant with his Son, in which he secured it, and appointed him to be the author of it, and sent him in the fulness of time to effect it; and Christ the Son of God, being qualified for it, being mighty to save, came into this world for that purpose, and is become the author of eternal salvation; his own arm has brought it to him, though there were many difficulties in the way; such as fulfilling the law, satisfying justice, making an end of sin, grappling with all the powers of darkness, and undergoing an accursed death: and the Spirit of God, he makes men sensible of their need of this salvation; he brings it near to them, and works faith in them to lay hold upon it, and shows them their interest in it; and in consequence of all this the glory of salvation belongs to the Lord, Father, Son, and Spirit, and should be given to the Father as the contriver of it, to the Son as the author of it, and to the Spirit as the applier of it; see Re 7:10;thy blessing [is] upon thy people; or it may be considered prayer wise, let "thy blessing [be] upon thy people" ; either upon those that were on the side of David, or on those, as others interpret it, who had imprudently joined themselves to Absalom; which latter sense, if right, shows in what a divine frame and disposition of mind the psalmist was, to pray for his enemies: or the words are an assertion, that the blessing of the Lord was come upon his covenant people, and does descend upon them as they are called by grace; even all spiritual blessings, the blessings of a justifying righteousness, of pardon of sin, of reconciliation and peace by the blood of Christ, of adoption, and of eternal life; the blessing of grace, and the blessing of glory.
Selah; on this word, See Gill on "Ps 3:2". Ktkrb "sit benedictio tua", Junius & Tremellius, Tarnovius, Gejerus, Michaelis.