As you have anointed their father, anoint them also as my priests. Thus, by being anointed, shall they receive a perpetual priesthood throughout all future generations.
Taking some of the anointing oil and some of the blood that was on the altar, Moses sprinkled it upon Aaron and his vestments, as well as his sons and their vestments, thus consecrating both Aaron and his vestments and his sons and their vestments.
But Nadab and Abihu died in the presence of the Lord when they offered unauthorized fire before the Lord in the wilderness of Sinai; and they left no sons. So only Eleazar and Ithamar served as priests during the lifetime of their father Aaron. Levites in Place of the Firstborn.
For the law appoints men subject to weakness to be high priests, but the word of the oath, which was taken after the law, appoints a son, who has been made perfect forever.