13. expecting--"waiting." Awaiting the execution of His Father's will, that all His foes should be subjected to Him. The Son waits till the Father shall "send Him forth to triumph over all His foes." He is now sitting at rest (Heb 10:12), invisibly reigning, and having His foes virtually, by right of His death, subject to Him. His present sitting on the unseen throne is a necessary preliminary to His coming forth to subject His foes openly. He shall then come forth to a visibly manifested kingdom and conquest over His foes. Thus He fulfils Ps 110:1. This agrees with 1Co 15:23-28. He is, by His Spirit and His providence, now subjecting His foes to Him in part (Ps 110:1-7). The subjection of His foes fully shall be at His second advent, and from that time to the general judgment (Re 19:1-20:15); then comes the subjection of Himself as Head of the Church to the Father (the mediatorial economy ceasing when its end shall have been accomplished), that God may be all in all. Eastern conquerors used to tread on the necks of the vanquished, as Joshua did to the five kings. So Christ's total and absolute conquest at His coming is symbolized.
      be made his footstool--literally, "be placed (rendered) footstool of His feet."
      his enemies--Satan and Death, whose strength consists in "sin"; this being taken away (Heb 10:12), the power of the foes is taken away, and their destruction necessarily follows.

JFB.