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.

Related Verses
“And these are the names of the sons of Aaron; Nadab the firstborn, and Abihu, Eleazar, and Ithamar.”
“And thou shalt appoint Aaron and his sons, and they shall wait on their priest’s office: and the stranger that cometh nigh shall be put to death.”
“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 take thou unto thee Aaron thy brother, and his sons with him, from among the children of Israel, that he may minister unto me in the priest’s office, even Aaron, Nadab and Abihu, Eleazar and Ithamar, Aaron’s sons.”
“But those that encamp before the tabernacle toward the east, even before the tabernacle of the congregation eastward, shall be Moses, and Aaron and his sons, keeping the charge of the sanctuary for the charge of the children of Israel; and the stranger that cometh nigh shall be put to death.”