Leviticus 16:1
“And the Lord spake unto Moses after the death of the two sons of Aaron, when they offered before the Lord, and died;”
And the Lord spake unto Moses after the death of the two sons of Aaron, when they offered before the Lord, and died;
And the Lord said unto Moses, Speak unto Aaron thy brother, that he come not at all times into the holy place within the vail before the mercy seat, which is upon the ark; that he die not: for I will appear in the cloud upon the mercy seat.
Thus shall Aaron come into the holy place: with a young bullock for a sin offering, and a ram for a burnt offering.
Counter-Arguments
The strongest case that this verse does not belong in this theme.

Cross-References
“And Nadab and Abihu, the sons of Aaron, took either of them his censer, and put fire therein, and put incense thereon, and offered strange fire before the Lord, which he commanded them not.”
“When they go into the tabernacle of the congregation, they shall wash with water, that they die not; or when they come near to the altar to minister, to burn offering made by fire unto the Lord:”
“And he shall take away all the fat thereof, as the fat of the lamb is taken away from the sacrifice of the peace offerings; and the priest shall burn them upon the altar, according to the offerings made by fire unto the Lord: and the priest shall make an atonement for his sin that he hath committed, and it shall be forgiven him.”
“And Nadab and Abihu, the sons of Aaron, took either of them his censer, and put fire therein, and put incense thereon, and offered strange fire before the Lord, which he commanded them not.”
“And there went out fire from the Lord, and devoured them, and they died before the Lord.”