The Lord shall reign for ever,.... The Messiah, who is King of kings and Lord of lords; and in this he is superior to, them, they reign but for a while, but he for evermore; the throne of majesty and glory on which he sits is for ever and ever; his kingdom is an everlasting kingdom; of his government, and the peace of it, there will be no end; he is King of saints now, and reigns in their hearts, and in his churches, and in the world; and he will reign with his people, and they with him, a thousand years on earth; and then they will reign together to all eternity; see Ps 14:6.
Both Jarchi and Kimchi refer this to the Messiah and his kingdom; the note of the former is,"he shall confirm his kingdom in the redemption or salvation of his children;''and of the latter,"it shall be said he is King over all, after he has executed judgment on the wicked in the valley of Jehoshaphat;''[even] thy God, O Zion, unto, all generations; he who is Zion's God is Zion's King, head over all things to the church; and this is her joy and comfort in every age, that her God and her King reigns, and will reign for evermore; and especially in a glorious manner in the latter day; see Isa 52:7; and as all this is a solid ground and foundation of truth in the Lord, and serves to encourage saints to make him their help and hope; and shows how happy they are that have him as such; so it is matter of praise and thanksgiving: hence it follows,praise ye the Lord; or "hallelujah"; and so the psalm ends as it began.