Bible Verses About The Sacred Vail: Allowed to enter but once a year

and Jehovah said unto Moses, Speak unto Aaron thy brother, that he come not at all times into the holy place within the veil, before the mercy-seat which is upon the ark; that he die not: for I will appear in the cloud upon the mercy-seat.

but into the second the high priest alone, once in the year, not without blood, which he offereth for himself, and for the errors of the people: