But Nadab and Abiu died before their father, and had no children: so Eleazar, and Ithamar did the office of the priesthood.

Nadab

Exodus 24:1,9 And he said to Moses: Come up to the Lord, thou, and Aaron, Nadab and Abiu, and seventy of the ancients of Israel, and you shall adore afar off. . . .

died

Leviticus 10:2 And fire coming out from the Lord destroyed them: and they died before the Lord.

Numbers 3:4 Now Nadab and Abiu died, without children, when they offered strange fire before the Lord, in the desert of Sinai: and Eleazar and Ithamar performed the priestly office in the presence of Aaron their father.

Numbers 26:61 Of whom Nadab and Abiu died, when they had offered the strange fire before the Lord.

Eleazar

Exodus 29:9 To wit, Aaron and his children, and thou shalt put mitres upon them; and they shall be priests to me by a perpetual ordinance. After thou shalt have consecrated their hands,

Leviticus 10:12 And Moses spoke to Aaron, and to Eleazar and Ithamar, his sons that were left: Take the sacrifice that is remaining of the oblation of the Lord, and eat it without leaven beside the altar, because it is holy of holies.

Numbers 16:39,40 Then Eleazar the priest took the brazen censers, wherein they had offered, whom the burning fire had devoured, and beat them into plates, fastening them to the altar: . . .

Numbers 18:7 But thou and thy sons look ye to the priesthood: and all things that pertain to the service of the altar, and that are within the veil, shall be executed by the priests. If any stranger shall approach, he shall be slain.