“And you shall put them on Aharon your brother and on his sons with him, and shall anoint them, and shall ordain them, and shall set them apart, and they shall serve as priests to Me.
And Mosheh took some of the anointing oil and some of the blood which was on the slaughter-place, and sprinkled it on Aharon, on his garments, and on his sons, and on the garments of his sons with him. And he set apart Aharon, his garments, and his sons, and the garments of his sons with him.
For the Torah appoints as high priests men who have weakness, but the word of the oath which came after the Torah, appoints the Son having been perfected forever.
“and shall anoint them, as you anointed their father, and they shall serve as priests to Me. And their anointing shall be for them an everlasting priesthood throughout their generations.
And Naḏaḇ and Aḇihu had died before יהוה when they brought strange fire before יהוה in the Wilderness of Sinai. And they had no children. So El‛azar and Ithamar acted as priests in the presence of Aharon their father.