Sing to the LORD, O you His saints, and praise His holy name.
PSALM 30. David having been delivered from great danger, not only renders thanks to God apart by himself, but at the same time invites and exhorts all the pious to perform the same duty. He then confesses that he had flattered himself too confidently in his prosperity, and that his security had justly been chastised. In the third place, having briefly expressed his sorrow, he returns again to thanksgiving.
Commenting on Psalm 30:1-12
Sing unto the Lord, O ye saints of his. "Join my song; assist me to express my gratitude." He felt that he could not praise God enough himself, and therefore he would enlist the hearts of others. Sing unto the Lord, O ye saints of his. David would not fill his choir with reprobates, but with sanctified persons, who could sing from their hearts.
It was the laudable practice of the pious Jews, and, though not expressly appointed, yet allowed and accepted, when they had built a new house, to dedicate it to God, Deu 20:5. David did so when his house was built, and he took possession of it (Sa2 5:11); for royal palaces do as much need God's protection, and are as much bound to be at his service, as ordinary houses.
Commenting on Psalm 30:1-5