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