Leviticus 16:2

2And he instructed him, saying: Speak to your brother Aaron, so that he may not, at any time, enter into the Sanctuary, which is within the veil, before the propitiatory by which the ark is covered, so that he may not die, (for I will appear in a cloud above the oracle)
16:2 Enter not: No one but the high priest, and he but once a year, could enter into the sanctuary; to signify that no one could enter into the sanctuary of heaven, till Christ our high priest opened it by his passion. Heb. 10.8.(Challoner)
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