Let Them Ever Sing For Joy!
But let all who take refuge in you be glad; let them ever sing for joy. Spread your protection over them, that those who love your name may rejoice in you. For surely, O LORD, you bless the righteous; you surround them with your favor as with a shield. (NIV)
But let all those rejoice who put their trust in You; Let them ever shout for joy, because You defend them; Let those also who love Your name be joyful in You. For You, O LORD, will bless the righteous; With favor You will surround him as with a shield. (NKJV)
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Verse 11. Joy is the privilege of the believer. When sinners are destroyed our rejoicing shall be full. They laugh first and weep ever after; we weep now, but shall rejoice eternally. When they howl we shall shout, and as they must groan for ever, so shall we ever shout for joy. This holy bliss of ours has a firm foundation, for, O Lord, we are joyful in thee. The eternal God is the well-spring of our bliss. We love God, and therefore we delight in him. Our heart is at ease in our God. We fare sumptuously every day because we feed on him. We have music in the house, music in the heart, and music in heaven, for the Lord Jehovah is our strength and our song; he also is become our salvation.
Verse 12. Jehovah has ordained his people the heirs of blessedness, and nothing shall rob them of their inheritance. With all the fulness of his power he will bless them, and all his attributes shall unite to satiate them with divine contentment. Nor is this merely for the present, but the blessing reaches into the long and unknown future. "Thou, Lord, wilt bless the righteous." This is a promise of infinite length, of unbounded breadth, and of unutterable preciousness. As for the defence which the believer needs in this land of battles, it is here promised to him in the fullest measure. There were vast shields used by the ancients as extensive as a man's whole person, which would surround him entirely. So says David, "With favour wilt thou compass him as with a shield." According to Ainsworth there is here also the idea of being crowned, so that we wear a royal helmet, which is at once our glory and defence. O Lord, ever give to us this gracious coronation! (Charles H. Spurgeon, The Treasury of David, Psalm 5)
See also, Calvin's Commentary