The sons of Amram: Aaron and Moses. Aaron and his descendants were chosen on a permanent basis to consecrate the most holy items, to offer sacrifices before the Lord, to serve him, and to praise his name.
They confronted King Uzziah and said to him, “It is not proper for you, Uzziah, to offer incense to the Lord. That is the responsibility of the priests, the descendants of Aaron, who are consecrated to offer incense. Leave the sanctuary, for you have disobeyed and the Lord God will not honor you!”
“And you, bring near to you your brother Aaron and his sons with him from among the Israelites, so that they may minister as my priests – Aaron, Nadab and Abihu, Eleazar and Ithamar, Aaron’s sons.
It was a memorial for the Israelites, that no outsider who is not a descendant of Aaron should approach to burn incense before the Lord, that he might not become like Korah and his company – just as the Lord had spoken by the authority of Moses.
Then he said to Korah and to all his company, “In the morning the Lord will make known who are his, and who is holy. He will cause that person to approach him; the person he has chosen he will cause to approach him.
put fire in them, and set incense on them before the Lord tomorrow, and the man whom the Lord chooses will be holy. You take too much upon yourselves, you sons of Levi!”
But you and your sons with you are responsible for your priestly duties, for everything at the altar and within the curtain. And you must serve. I give you the priesthood as a gift for service; but the unauthorized person who approaches must be put to death.”