Hebrews 9:3-8

Behind the second veil there was another tabernacle [the inner one or second section] known as the Holy of Holies, [Ex 26:31-33] having the golden altar of incense and the ark of the covenant covered entirely with gold. This contained a golden jar which held the manna, and the rod of Aaron that sprouted, and the [two stone] tablets of the covenant [inscribed with the Ten Commandments]; [Ex 16:32-34; 30:1-6; Num 17:8-10] and above the ark were the [golden] cherubim of glory overshadowing the mercy seat; but we cannot now go into detail about these things. Now when these things have been prepared in this way, the priests continually enter the outer [or first section of the] tabernacle [that is, the Holy Place] performing [their ritual acts of] the divine worship, but into the second [inner tabernacle, the Holy of Holies], only the high priest enters [and then only] once a year, and never without [bringing a sacrifice of] blood, which he offers [as a substitutionary atonement] for himself and for the sins of the people committed in ignorance. [Lev 16:15] By this the Holy Spirit signifies that the way into the Holy Place [the true Holy of Holies and the presence of God] has not yet been disclosed as long as the first or outer tabernacle is still standing [that is, as long as the Levitical system of worship remains a recognized institution]