Exodus 28:1 Ex. 28:1
And take thou unto thee Aaron thy brother, and his sons with him, from among the children of Israel, that he may minister unto me in the priest's office, even Aaron, Nadab and Abihu, Eleazar and Ithamar, Aaron's sons.
Hebrews 7:14 Heb. 7:14
For it is evident that our Lord sprang out of Juda; of which tribe Moses spake nothing concerning priesthood.
(Relation)