And to Mosheh He said, “Come up to יהוה, you and Aharon, Naḏaḇ and Aḇihu, and seventy of the elders of Yisra’ĕl, and you shall bow yourselves from a distance.
and shall gird them with girdles – Aharon and his sons – and put the turbans on them. And the priesthood shall be theirs for an everlasting law. So you shall ordain Aharon and his sons.
And Mosheh spoke to Aharon, and to El‛azar and Ithamar, his sons who were left, “Take the grain offering that is left over from the offerings made by fire to יהוה, and eat it without leaven beside the slaughter-place, for it is most set-apart.
“But you and your sons with you are to guard your priesthood for all matters at the slaughter-place and behind the veil, and you shall serve. I have given you the priesthood as a gift for service, but the stranger who comes near is put to death.”
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.