John Gill Commentary Psalms 146:10

"Jehovah will reign for ever, Thy God, O Zion, unto all generations. Praise ye Jehovah." — Psalms 146:10 (ASV)

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 (Psalms 14:6) (Isaiah 9:7) (Daniel 2:44) . 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 (Isaiah 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.