Hebrews 5:4
No one takes this honor upon himself; he must be called by God, just as Aaron was.

Exodus 30:7
And Aaron is to burn fragrant incense on it every morning when he tends the lamps.

Numbers 1:51
Whenever the tabernacle is to move, the Levites are to take it down, and whenever it is to be pitched, the Levites are to set it up. Any outsider who goes near it must be put to death.

Numbers 16:39
So Eleazar the priest took the bronze censers brought by those who had been burned up, and he had them hammered out to overlay the altar,

Joshua 4:7
you are to tell them, 'The waters of the Jordan were cut off before the ark of the covenant of the LORD. When it crossed the Jordan, its waters were cut off.' Therefore these stones will be a memorial to the Israelites forever."

2 Chronicles 26:18
They took their stand against King Uzziah and said, "Uzziah, you have no right to offer incense to the LORD. Only the priests, the descendants of Aaron, are consecrated to burn incense. Leave the sanctuary, for you have acted unfaithfully; you will not receive honor from the LORD God."

Ezra 2:62
These men searched for their family records, but they could not find them and so were excluded from the priesthood as unclean.

Ezekiel 40:46
and the chamber that faces north is for the priests who have charge of the altar. These are the sons of Zadok, the only Levites who may approach the LORD to minister before Him."

Ezekiel 43:19
You are to give a young bull from the herd as a sin offering to the Levitical priests who are of the family of Zadok, who approach Me to minister before Me, declares the Lord GOD.