Jamieson, Fausset and Brown on Ezekiel 28:14

14. anointed cherub--Gesenius translates from an Aramaic root, "extended cherub." English Version, from a Hebrew root, is better. "The cherub consecrated to the Lord by the anointing oil" [Fairbairn].

covereth--The imagery employed by Ezekiel as a priest is from the Jewish temple, wherein the cherubim overshadowed the mercy seat, as the king of Tyre, a demi-god in his own esteem, extended his protection over the interests of Tyre. The cherub--an ideal compound of the highest kinds of animal existence and the type of redeemed man in his ultimate state of perfection--is made the image of the king of Tyre, as if the beau ideal of humanity. The pretensions of Antichrist are the ulterior reference, of whom the king of Tyre is a type. Compare "As God ... in the temple of God" (2Th 2:4).

I have set thee--not thou set thyself (Pr 8:16; Ro 13:1).

upon the holy mountain of God--Zion, following up the image.

in ... midst of ... stones of fire--In ambitious imagination he stood in the place of God, "under whose feet was, as it were, a pavement of sapphire," while His glory was like "devouring fire" (Ex 24:10, 17).