7 For the king trusteth in the LORD, and through the mercy of the most High he shall not be moved.
8 Thine hand shall find out all thine enemies: thy right hand shall find out those that hate thee.
9 Thou shalt make them as a fiery oven in the time of thine anger: the LORD shall swallow them up in his wrath, and the fire shall devour them.
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Commentary on Psalms 21 Matthew Henry Commentary
Psalm 21
As the foregoing psalm was a prayer for the king that God would protect and prosper him, so this is a thanksgiving for the success God had blessed him with. Those whom we have prayed for we ought to give thanks for, and particularly for kings, in whose prosperity we share. They are here taught,
In this there is an eye to Messiah the Prince, and the glory of his kingdom; for to him divers passages in this psalm are more applicable than to David himself.
To the chief musician. A psalm of David.
Psa 21:1-6
David here speaks for himself in the first place, professing that his joy was in God's strength and in his salvation, and not in the strength or success of his armies. He also directs his subjects herein to rejoice with him, and to give God all the glory of the victories he had obtained; and all with an eye to Christ, of whose triumphs over the powers of darkness David's victories were but shadows.
In singing this we should rejoice in his joy and triumph in his exaltation.
Psa 21:7-13
The psalmist, having taught his people to look back with joy and praise on what God had done for him and them, here teaches them to look forward with faith, and hope, and prayer, upon what God would further do for them: The king rejoices in God (v. 1), and therefore we will be thankful; the king trusteth in God (v. 7), therefore will we be encouraged. The joy and confidence of Christ our King is the ground of all our joy and confidence.