Numbers 16:40

as a reminder to the sons of Israel so that no layman—that is, one who is not of the descendants of Aaron should approach to offer incense before the Lord; so that he will not become like Korah and as his company—just as the Lord had said to him through Moses.

Numbers 3:10

So you shall appoint Aaron and his sons, and they shall observe and attend to their priesthood; but the layman (non-Levite) who approaches [the holy things] shall be put to death.”

Exodus 30:7-10

Aaron shall burn sweet and fragrant incense on it; he shall burn it every morning when he trims and tends the lamps.

Leviticus 22:10

‘No layman [that is, someone outside of Aaron’s family] is to eat the holy gift [which has been offered to God]; a foreigner residing with the priest or a hired man shall not eat the holy thing.

Numbers 1:51

When the tabernacle is to go forward, the Levites shall take it down; and when the tabernacle is to [be set up for] camp, the Levites shall set it up. But the layman (non-Levite) who approaches the tabernacle shall be put to death.

Numbers 3:38

Now those to camp before the tabernacle toward the east, before the Tent of Meeting, toward the sunrise, were to be Moses, and Aaron and his sons, performing the duties of the sanctuary for whatever was required of the Israelites; and the layman (non-Levite) who approached [the sanctuary] was to be put to death.

Numbers 18:4-7

They shall join you and attend to the duties of the Tent of Meeting—all the service of the tent—and no stranger [no layman, anyone who is not a Levite] may approach you [and your sons].

1 Kings 13:1-3

Now behold, there came a man of God from Judah to Bethel by the word (command) of the Lord, while Jeroboam was standing by the altar [which he had built] to burn incense.

2 Chronicles 26:16-21

But when Uzziah became strong, he became so proud [of himself and his accomplishments] that he acted corruptly, and he was unfaithful and sinned against the Lord his God, for he went into the temple of the Lord to burn incense on the altar of incense.

Jude 1:11

Woe to them! For they have gone the [defiant] way of Cain, and for profit they have run headlong into the error of Balaam, and perished in the rebellion of [mutinous] 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
So you shall appoint Aaron and his sons, and they shall observe and attend to their priesthood; but the layman (non-Levite) who approaches [the holy things] shall be put to death.”
Numbers 18:4
They shall join you and attend to the duties of the Tent of Meeting—all the service of the tent—and no stranger [no layman, anyone who is not a Levite] may approach you [and your sons].
Leviticus 22:10
‘No layman [that is, someone outside of Aaron’s family] is to eat the holy gift [which has been offered to God]; a foreigner residing with the priest or a hired man shall not eat the holy thing.
2 Chronicles 26:18
They opposed King Uzziah and said to him, “It is not for you, Uzziah, to burn incense to the Lord, but for the priests, the sons of Aaron who have been consecrated to burn incense. Get out of the sanctuary, for you have been unfaithful and will have no honor from the Lord God.”
Jude 1:11
Woe to them! For they have gone the [defiant] way of Cain, and for profit they have run headlong into the error of Balaam, and perished in the rebellion of [mutinous] Korah.

Come near

1 Kings 13:1
Now behold, there came a man of God from Judah to Bethel by the word (command) of the Lord, while Jeroboam was standing by the altar [which he had built] to burn incense.
2 Chronicles 26:16
But when Uzziah became strong, he became so proud [of himself and his accomplishments] that he acted corruptly, and he was unfaithful and sinned against the Lord his God, for he went into the temple of the Lord to burn incense on the altar of incense.

General references

Numbers 16:6
Do this: Take censers for yourselves, Korah and all your company,
Psalm 106:18

And a fire broke out in their company;
The flame consumed the wicked.
Psalm 115:10

O house of Aaron, trust in the Lord;
He is their help and their shield.
Hebrews 5:4
And besides, one does not appropriate for himself the honor [of being high priest], but he who is called by God, just as Aaron was.