Revelation 15:3

And they sing the song of Moses the servant of God, and the song of the Lamb, saying, Great and marvelous are thy works, O Lord God, the Almighty; righteous and true are thy ways, thou King of the ages.

And they sing the song of Moses ... and ... the Lamb ... Morris said of this, "They sing (presumably to their own harp accompaniment)."[26] At least, Morris named such a conclusion what it is; namely, a presumption, a presumption which we do not allow for a moment as in any sense valid. The notion of literal harps is simply not in this passage. The text says "they sing."

Of Moses and of the Lamb ... Perhaps no more is meant by this than the unity of the saints of both the Old Testament and the New Testament. Moses was the grand Old Testament type of Christ. See extensive development of this in my Commentary on Hebrews, pp. 67-69. The song is that of redemption.

Great and marvelous are thy works, O Lord God, the Almighty ... Significantly, this song, made up of a blended collection of Old Testament texts, deals not with the overcoming of the saints, but with the mighty works of God. "There is not a single word about their own achievement."[27] Self is at last forgotten; selfishness is finally destroyed. In heaven, the song of Moses and the Lamb is exclusively an anthem of loving praise to the Almighty.

The Almighty ... "This title, which is ascribed to God nine times in Revelation, is found but once elsewhere in the New Testament (2 Corinthians 6:18)."[28]

Thou King of the ages ... The KJV has "King of the saints," and the ASV margin has "King of the nations." The passage is true, however it may be rendered.

[26] Leon Morris, op. cit., p. 188.

[27] William Barclay, The Revelation of John (Philadelphia: The Westminster Press, 1976), p. 120.

[28] Robert H. Mounce, Commentary on the New Testament, Revelation (Grand Rapids, Michigan: Wm. B. Eerdmans Publishing Company, 1977), p. 288.