Hebrews 9:7, 12, 24-25

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]

He went once for all into the Holy Place [the Holy of Holies of heaven, into the presence of God], and not through the blood of goats and calves, but through His own blood, having obtained and secured eternal redemption [that is, the salvation of all who personally believe in Him as Savior].

For Christ did not enter into a holy place made with hands, a mere copy of the true one, but [He entered] into heaven itself, now to appear in the very presence of God on our behalf; nor did He [enter into the heavenly sanctuary to] offer Himself again and again, as the high priest enters the Holy Place every year with blood that is not his own.