Hebrews 9:7
But [only] once a year the head priest goes alone into the inner room [i.e., Holy of Holies], and never without [animal] blood, which he offers [as a sacrifice] for himself and for the sins done in ignorance by the people.
Hebrews 9:24-25
For Christ did not enter the Holy of Holies made by hand, which is [only] a counterpart of the true one, but into heaven itself, where He now appears in God's presence for us. [See verse 12].
Hebrews 9:12
And He did not enter [the heavenly Holy of Holies] by means of the blood of goats and calves but, by means of His own blood He entered the Holy of Holies [i.e., heaven] once for all time, [after] having obtained never ending redemption [i.e., salvation for us on the cross].