Numbers 8:19
I've set the descendants of Levi apart from the Israelis so that Aaron and his sons would work in service at the appointed place of meeting, making atonement on behalf of the Israelis so that there won't be a plague among the Israelis whenever they approach the sanctuary."
Numbers 1:53
But the descendants of Levi are to encamp on all sides of the Tent of Meeting so that divine wrath won't fall on the congregation of Israel. The descendants of Levi are to take care of the Tent of Meeting."
Numbers 16:46
But they fell upon their faces. Then Moses told Aaron. "Take the censer, put fire on it from the altar, and burn some incense. Then walk quickly to the congregation and atone for them, because wrath has already come out from the LORD the plague has begun."
Numbers 3:6-9
"Bring the tribe of Levi near and present them to Aaron the priest so they may serve him.
Numbers 18:2-6
Moreover, bring your brothers from your father's tribe of Levi with you, so they may join you and minister to you while you and your sons with you stand in the presence of the Tent of Testimony.
1 Samuel 6:19
God struck down the men of Beth-shemesh because they had looked into the Ark of the LORD. He struck down 50,070 men among the people, and the people mourned because the LORD struck down the people with a great slaughter.
1 Chronicles 23:28-32
David issued these orders:
2 Chronicles 26:16-20
But after he had become strong, in his arrogance he acted corruptly and became unfaithful to the LORD his God, and he dared to enter the LORD's Temple to burn incense on the incense altar.
Ezekiel 44:11-14
Nevertheless, they are to serve in my sanctuary, overseeing the gates of the Temple, taking care of the Temple, slaughtering the burnt offerings and the sacrifices presented for the people, standing in the presence of the people, and ministering to them.