Numbers 3:4
“And Nadab and Abihu died before the Lord, when they offered strange fire before the Lord, in the wilderness of Sinai, and they had no children: and Eleazar and Ithamar ministered in the priest’s office in the sight of Aaron their father.”
And these are the names of the sons of Aaron; Nadab the firstborn, and Abihu, Eleazar, and Ithamar.
These are the names of the sons of Aaron, the priests which were anointed, whom he consecrated to minister in the priest’s office.
And Nadab and Abihu died before the Lord, when they offered strange fire before the Lord, in the wilderness of Sinai, and they had no children: and Eleazar and Ithamar ministered in the priest’s office in the sight of Aaron their father.
And the Lord spake unto Moses, saying,
Bring the tribe of Levi near, and present them before Aaron the priest, that they may minister unto him.
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.”
“And Nadab and Abihu died, when they offered strange fire before the Lord.”
“And ye shall give her unto Eleazar the priest, that he may bring her forth without the camp, and one shall slay her before his face:”
“And Nadab and Abihu died, when they offered strange fire before the Lord.”
“And these are the sons of Aaron; Eleazar his son, Phinehas his son, Abishua his son,”