Exodus 28:1
And take you to you Aaron your brother, and his sons with him, from among the children of Israel, that he may minister to me in the priest's office, even Aaron, Nadab and Abihu, Eleazar and Ithamar, Aaron's sons.
Torrey's Topical Textbook—AKJV

Hebrews 5:4,5
And no man takes this honor to himself, but he that is called of God, as was Aaron.
Torrey's Topical Textbook—AKJV

Leviticus 16:15
Then shall he kill the goat of the sin offering, that is for the people, and bring his blood within the veil, and do with that blood as he did with the blood of the bullock, and sprinkle it on the mercy seat, and before the mercy seat:
Torrey's Topical Textbook—AKJV

Hebrews 9:7,24
But into the second went the high priest alone once every year, not without blood, which he offered for himself, and for the errors of the people:
Torrey's Topical Textbook—AKJV