Sing unto the LORD, O ye saints of his, and give thanks at the remembrance of his holiness.
David's particular case is a sample of the universal character of God's gracious dealings with all His people; he therefore calls on 'all the saints of God' to join with him in praises (Psalms 97:12).
Give thanks ... his holiness - literally, 'confess (for when we give thanks to God, we can never exceed the truth; we are always only confessing what God actually is) to the memorial of His holiness.' The holy name of God is what God calls His "memorial" (Exodus 3:15; Hosea 12:5). His manifestation in act of His attributes of power, wisdom, and love to His saints, is to be had by them in everlasting remembrance (Isaiah 26:8; Psalms 135:13). "Holiness" is impressed on His "memorial," in that the latter is elevated infinitely above all created beings, and is by them to be regarded with humble adoration. Compare note, Psalms 22:3. His forbearing compassion and grace flow from His "holiness," which is raised far above human passions (cf. Hosea 11:9).