Numbers 3:2-4

New International Version

² The names of the sons of Aaron were Nadab the firstborn^(A) and Abihu, Eleazar and Ithamar.^{(B) 3} Those were the names of Aaron’s sons, the anointed priests,^(C) who were ordained to serve as priests. ⁴ Nadab and Abihu, however, died before the Lord^(D) when they made an offering with unauthorized fire before him in the Desert of Sinai.^(E) They had no sons, so Eleazar and Ithamar^(F) served as priests during the lifetime of their father Aaron.^(G)