You shall put them on your brother Aaron, and on his sons with him, and shall anoint them and ordain them and consecrate them, so that they may serve me as priests.
and anoint them, as you anointed their father, that they may serve me as priests: and their anointing shall admit them to a perpetual priesthood throughout all generations to come.
Then Moses took some of the anointing oil and some of the blood that was on the altar and sprinkled them on Aaron and his vestments, and also on his sons and their vestments. Thus he consecrated Aaron and his vestments, and also his sons and their vestments.
Nadab and Abihu died before the Lord when they offered illicit fire before the Lord in the wilderness of Sinai, and they had no children. Eleazar and Ithamar served as priests in the lifetime of their father Aaron.
For the law appoints as high priests those who are subject to weakness, but the word of the oath, which came later than the law, appoints a Son who has been made perfect forever.