Exodus 28:1; Hebrews 5:4

The Priests' Garments

28 Then bring near to you xAaron your brother, and his sons with him, from among the people of Israel, to serve me as priestsAaron and Aaron's sons, yNadab and Abihu, Eleazar and Ithamar.


And pno one takes this honor for himself, but only when called by God, qjust as Aaron was.