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

Exodus 40:12-15
And you shall bring Aaron and his sons to the door of the tabernacle of the congregation, and wash them with water.
Torrey's Topical Textbook—AKJV