The Holy Spirit this signifying, that the way into the holiest of all was not yet made manifest, while the first tabernacle was yet standing:
All Commentaries on Hebrews 9:8 Go To Hebrews 9
John Chrysostom
AD 407
3. Thus far there is no speculation. But from this point he philosophizes and says, Hebrews 9:8 The Holy Ghost this signifying, that the way into the Holiest of all was not yet made manifest, while as the first tabernacle was yet standing. For this cause (he says) have these things been thus ordained, that we might learn that the Holy of Holies, that is, Heaven, is as yet inaccessible. Let us not then think (he says) that because we do not enter them, they have no existence: inasmuch as neither did we enter the Most Holy [place].
