Hebrews 2:5

"For not to angels," he says, "did He put in subjection the world to come, whereof we speak." Is he then discoursing concerning some other world? No, but concerning this. Therefore he added "whereof we speak," that he might not allow the mind to wander away in search of some other. How then does he call it "the world to come"? Exactly as he also says in another place, "Who is the figure of him that was to come," (Rom. v. 14,) when he is speaking about Adam and Christ in the Epistle to the Romans; calling Christ according to the flesh "Him that was to come" in respect of the times of Adam, (for [then] He was to come). So now also, since he had said, "but when he bringeth in the First-Begotten into the world": that thou mightest not suppose that he is speaking of another world, it is made certain from many considerations and from his saying "to come." For the world was to come, but the Son of God always was. This world then which was about to come, He put in subjection not to Angels but to Christ. For that this is spoken with reference to the Son (he says) is evident: for surely no one would assert the other alternative, that it had reference to Angels.