Who shall
The order is:
(1) the declaration of title, "the earth is the Lord's" (Psalms 24:1); (Psalms 24:2).
(2) Who shall rule the earth? (Psalms 24:3-6). It is a question of worthiness, and no one is worthy but the Lamb.
Compare (Daniel 7:13); (Daniel 7:14); (Revelation 5:3-10); (Matthew 25:31).
(3) The King of glory takes the throne of earth (Psalms 24:7-10).
See Psalm 40, next in order of the Messianic Psalms.