O {a} give thanks unto the LORD; for he is good: because his mercy endureth for ever.

(a) Because God by creating David king, showed his mercy toward his afflicted Church, the prophet not only thanks God himself, but exhorts all the people to do the same.

Jamieson-Fausset-Brown Bible Commentary

PSALM 118

Ps 118:1-29. After invoking others to unite in praise, the writer celebrates God's protecting and delivering care towards him, and then represents himself and the people of God as entering the sanctuary and uniting in solemn praise, with prayer for a continued blessing. Whether composed by David on his accession to power, or by some later writer in memory of the restoration from Babylon, its tone is joyful and trusting, and, in describing the fortune and destiny of the Jewish Church and its visible head, it is typically prophetical of the Christian Church and her greater and invisible Head.

1-4. The trine repetitions are emphatic (compare Ps 118:10-12, 15, 16; 115:12, 13).

Let . say-Oh! that Israel may say.

now-as in Ps 115:2; so in Ps 118:3, 4. After "now say" supply "give thanks."

that his mercy-or, "for His mercy."

Matthew Henry's Concise Commentary

118:1-18 The account the psalmist here gives of his troubles is very applicable to Christ: many hated him without a cause; nay, the Lord himself chastened him sorely, bruised him, and put him to grief, that by his stripes we might be healed. God is sometimes the strength of his people, when he is not their song; they have spiritual supports, though they want spiritual delights. Whether the believer traces back his comfort to the everlasting goodness and mercy of God, or whether he looks forward to the blessing secured to him, he will find abundant cause for joy and praise. Every answer to our prayers is an evidence that the Lord is on our side; and then we need not fear what man can do unto us; we should conscientiously do our duty to all, and trust in him alone to accept and bless us. Let us seek to live to declare the works of God, and to encourage others to serve him and trust in him. Such were the triumphs of the Son of David, in the assurance that the good pleasure of the Lord should prosper in his hand.