Adam Clarke on Isaiah 60:13

And I will make the place of my feet glorious "And that I may glorify the place whereon I rest my feet" - The temple of Jerusalem was called the house of God, and the place of his rest or residence. The visible symbolical appearance of God, called by the Jews the schechinah, was in the most holy place, between the wings of the cherubim, above the ark. This is considered as the throne of God, presiding as King over the Jewish state; and as a footstool is a necessary appendage to a throne, (see note on Isa 52:2 (note)), the ark is considered as the footstool of God, and is so called, Psa 99:6; 1Chr 28:2.

The glory of Lebanon - That is, the cedar.