Who is this King of glory? The LORD of hosts, he is the King of glory. Selah.
The Lord of hosts - rather, as 'Yahweh' (Hebrew for "the Lord") is not usually made to govern the genitive in this way, 'Yahweh (the God) of hosts.' As an intensification of the idea in the corresponding Psalms 24:8, we must there take "the Lord mighty in battle" as referring to His Almighty power on earth; but here "The Lord of hosts," as referring to His Almighty Lordship over both the material starry hosts, and the spiritual hosts of angels in heaven. Sabeanism, or the worship of 'the hosts (sabaoth) of heaven'-the sun, moon, and stars-must give place to Yahweh, the Lord of Sabaoth.
The concluding verse confirms the opening verse. His being Lord of the earth is established by His most glorious attribute of power, His Lordship over the heavens.