everlasting doors. age-abiding entrances. The tabernacle (or tent) of David, on Mount Zion, was not ancient. This looks forward to the fulfilment of prophecy in times yet to come.
King of glory. Glorious king. The repeated question points us both to Psalms 22:6 ("a worm, and no man") and to Psalms 23:1 (The Shepherd).