Psalms 21:13
Ver. 13. Be thou exalted, Lord, in thine own strength,.... Exert thy strength, display thy power in such manner, that thou mayest be exalted and magnified on account of it. This was fulfilled at the destruction of Jerusalem, when the kingdom of God came with power, Mr 9:1; and will be again when Babylon shall be utterly destroyed, because the Lord is strong who judgeth her, Re 18:8; and finally at the day of judgment, when the wicked will be punished with everlasting destruction from the presence of the Lord, and the glory of his power, 2Th 1:9;
[so] will we sing and praise thy power; forms of such songs of praise may be seen, as Cocceius observes, in Re 11:15; at the sounding of the seventh trumpet, at the victory over the beast, and his image, and at the destruction of Babylon.
John Gill's Exposition of the Entire Bible.