Matthew Poole and continuators on Hebrews 9:3

3 And after the second v[illegible: 1 letter]il, the Tabernacle which is called the Holiest of all .

This distinguisheth the second Tabernacle from the first; for, passing through it to the end of it, there hung up a curious Vail made of Blew, Purple, Scarlet, and fine twined Linnen, with Figures of Cherubims, Exod. 26.31, 32. and 36.35, 36. and 40.21. The Mystery of which is interpreted after v. 8. see chap. 6.19. A Vail noteth distance and obscurity; or, covering, opposite to that which is open and free; behind this Vail was the second Tabernacle.

Called the Holy of Holiest, Exod. 26.33. by God himself, which did really, though typically hold out the Place of God's special Appearance for Propitiation and gracious Answers of Peace to the desires of his People in the Lord Jesus, applied afterwards to Heaven it self, the Holiest of all, where the High-Priest is entred for us, and sits at the Right-hand of his Father, making intercession for us, ch. 6.19, 20. and 7.25. and 9.24. and 10.19.