This psalm, though without a title, was written by David, as appears from Heb 4:7, and to him the Septuagint, Vulgate Latin, Syriac, Arabic, and Ethiopic versions ascribe it. It belongs to the times of the Messiah, as Kimchi observes; the apostle applies it to the Jews of his time, and bespeaks them in the language of it, Heb 3:7, and in which time Israelites, believers in Christ, are called upon to serve and worship him, in consideration of his greatness in himself, and his goodness to them.
Theodoret thinks that David spoke prophetically of King Josiah and his times; and wrote it in the person of him, and the priests of God.Ver. 1. O come, let us sing unto the Lord,.... To Jehovah the Messiah, the Lord our righteousness; setting forth, in songs of praise, the glory of his person, the riches of his grace, and our thankfulness to him for spiritual mercies by him: Christ is to be the subject of our spiritual songs, and is the person to whose honour and glory they should be directed: in the New Testament we are instructed to sing unto the Lord, the Lord Christ, Eph 5:19, and this is what Pliny tells Trajan, the Roman emperor, the Christians in his time did; they sung a hymn to Christ, as to a God:let us make a joyful noise to the Rock of our salvation; to Christ, the Rock, 1Co 10:4, a Rock, for height, being higher than the saints, than the kings of the earth, than the angels in heaven, than the heavens themselves; for strength, being the mighty God, and mighty Saviour; for shelter, being the saints security from avenging justice and wrath to come: a Rock, on which the church and all believers are built, and which endures for ever; "the Rock of salvation", being the author of spiritual and eternal salvation, and the strength and security of it; not only is he strong to do it, but, being done by him, it is safe in him; wherefore shouts of joy and songs of praise are due unto him.
This shows that vocal singing is meant, singing with an harmonious and musical voice; and that social singing, or singing in concert together, is intended. The Septuagint renders it, "to God our Saviour", Lu 1:47.
Ep. l. 10. ep.