Lev 16, 2 Not to come whenever he pleases into the sanctuary

Leviticus 16 (chosen pages)

(Lev 16, 2) Not to come whenever he pleases into the sanctuary

[2] and said to him, "Tell your brother Aaron that he is not to come whenever he pleases into the sanctuary, inside the veil, in front of the propitiatory on the ark; otherwise, when I reveal myself in a cloud above the propitiatory, he will die.

(CCC 433) The name of the Savior God was invoked only once in the year by the high priest in atonement for the sins of Israel, after he had sprinkled the mercy seat in the Holy of Holies with the sacrificial blood. The mercy seat was the place of God's presence (Cf. Ex 25:22; Lev 16:2,15-16; Num 7:89; Sir 50:20; Heb 9:5,7). When St. Paul speaks of Jesus whom "God put forward as an expiation by his blood", he means that in Christ's humanity "God was in Christ reconciling the world to himself" (Rom 3:25; 2 Cor 5:19).