(13) Expecting.--This word belongs to the contrast just mentioned. He does not minister and offer His sacrifice again, but waits for the promised subjection of His foes. Once before in this context (Hebrews 9:28) our thought has been thus directed to the future consummation. There it consists in the second coming of Christ for the salvation of "them that wait for Him;" here it is He Himself who is "waiting," and the end is the attainment of supreme dominion. (See Hebrews 1:3; Hebrews 1:13.)
10:11-18 Under the new covenant, or gospel dispensation, full and final pardon is to be had. This makes a vast difference between the new covenant and the old one. Under the old, sacrifices must be often repeated, and after all, only pardon as to this world was to be obtained by them. Under the new, one Sacrifice is enough to procure for all nations and ages, spiritual pardon, or being freed from punishment in the world to come. Well might this be called a new covenant. Let none suppose that human inventions can avail those who put them in the place of the sacrifice of the Son of God. What then remains, but that we seek an interest in this Sacrifice by faith; and the seal of it to our souls, by the sanctification of the Spirit unto obedience? So that by the law being written in our hearts, we may know that we are justified, and that God will no more remember our sins.
Till his enemies be made his footstool; see Gill on Hebrews 1:13.