Numbers 16:40

To be a sign, kept in memory for ever by the children of Israel, that no man who is not of the seed of Aaron has the right of burning spices before the Lord, so that he may not be like Korah and his band: as the Lord said to him by the mouth of Moses.

Numbers 3:10

And give orders that Aaron and his sons are to keep their place as priests; any strange person who comes near is to be put to death.

Exodus 30:7-10

And on this altar sweet spices are to be burned by Aaron every morning when he sees to the lights.

Leviticus 22:10

No outside person may take of the holy food, or one living as a guest in the priest's house, or a servant working for payment.

Numbers 1:51

And when the Tent of meeting goes forward, the Levites are to take it down; and when it is to be put up, they are to do it: any strange person who comes near it is to be put to death.

Numbers 3:38

And those whose tents are to be placed on the east side of the House in front of the Tent of meeting, looking to the dawn, are Moses and Aaron and his sons, who will do the work of the holy place for the children of Israel; and any strange person who comes near will be put to death.

Numbers 18:4-7

They are to be joined with you in the care of the Tent of meeting, doing whatever is needed for the Tent: and no one of any other family may come near you.

1 Kings 13:1-3

Then a man of God came from Judah by the order of the Lord to Beth-el, where Jeroboam was by the altar, burning offerings.

2 Chronicles 26:16-21

But when he had become strong, his heart was lifted up in pride, causing his destruction; and he did evil against the Lord his God; for he went into the Temple of the Lord for the purpose of burning perfumes on the altar of perfumes.

Jude 1:11

A curse on them! They have gone in the way of Cain, running uncontrolled into the error of Balaam for reward, and have come to destruction by saying evil against the Lord, like Korah.

Treasury of Scripture Knowledge

Summary

To be a memorial unto the children of Israel, that no stranger, which is not of the seed of Aaron, come near to offer incense before the LORD; that he be not as Korah, and as his company: as the LORD said to him by the hand of Moses.

Bible References

That no

Numbers 3:10
And give orders that Aaron and his sons are to keep their place as priests; any strange person who comes near is to be put to death.
Numbers 18:4
They are to be joined with you in the care of the Tent of meeting, doing whatever is needed for the Tent: and no one of any other family may come near you.
Leviticus 22:10
No outside person may take of the holy food, or one living as a guest in the priest's house, or a servant working for payment.
2 Chronicles 26:18
And they made protests to Uzziah the king, and said to him, The burning of perfumes, Uzziah, is not your business but that of the priests, the sons of Aaron, who have been made holy for this work: go out of the holy place, for you have done wrong, and it will not be to your honour before God.
Jude 1:11
A curse on them! They have gone in the way of Cain, running uncontrolled into the error of Balaam for reward, and have come to destruction by saying evil against the Lord, like Korah.

Come near

1 Kings 13:1
Then a man of God came from Judah by the order of the Lord to Beth-el, where Jeroboam was by the altar, burning offerings.
2 Chronicles 26:16
But when he had become strong, his heart was lifted up in pride, causing his destruction; and he did evil against the Lord his God; for he went into the Temple of the Lord for the purpose of burning perfumes on the altar of perfumes.

General references

Numbers 16:6
So do this: let Korah and all his band take vessels for burning perfumes;
Psalm 106:18
And a fire was lighted among their tents; the sinners were burned up by the flames.
Psalm 115:10
O house of Aaron, have faith in the Lord: he is their help and their breastplate.
Hebrews 5:4
And no man who is not given authority by God, as Aaron was, takes this honour for himself.

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain