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
George Leo Haydock
AD 1849
The Holy Spirit signifying this. Here the apostle begins to tell us in what manner the sanctuary was a figure of things in the new law of Christ. The holy of holies was a figure of heaven, and this prohibition of any one going into it, was to signify that the way to heaven was not to be made manifest, nor to be opened, as long as the former tabernacle and law subsisted; that it was not to be opened till Christ, the high priest of the new testament, first entered, by shedding his blood on the cross, and by his glorious ascension. (Witham)
But when Christ expired, the veil of temple was rent asunder, to show that the way to heaven was now laid open to mankind.