Reference: Abihu
Hastings
Second son of Aaron (Ex 6:23; Nu 3:2; 26:60; 1Ch 6:3; 24:1); accompanied Moses to the top of Sinai (Ex 24:1,9); admitted to the priest's office (Ex 28:1); slain along with his brother Nadab for offering strange fire (Le 10:1-2; Nu 3:4; 26:61; 1Ch 24:2).
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Then Aaron married Elisheba daughter of Amminadab, sister of Nahshon. She bore him Nadab, Abihu, Eleazar, and Ithamar.
The LORD told Moses, "Come up to the LORD, you and Aaron, Nadab and Abihu, and 70 of the elders of Israel, and worship at a distance.
Then Moses and Aaron, Nadab and Abihu, and 70 of the elders of Israel went up
"You are to bring your brother Aaron, along with his sons, from among the Israelis so they can serve as priests for me: that is, Aaron and his sons Nadab, Abihu, Eleazar, and Ithamar.
Aaron's sons Nadab and Abihu each took his own censer, placed fire in it, covered it with incense, and brought it into the LORD's presence as unauthorized fire that he had never prescribed for them. As a result, fire came out from the LORD's presence and incinerated them. They died while in the LORD's presence.
The sons of Aaron were Nadab the first-born, Abihu, Eleazar, and Ithamar
Nadab and Abihu died in the LORD's presence when they offered unauthorized fire before him in the Sinai wilderness. Since they didn't have their own children, Eleazar and Ithamar ministered as priests under the authority of Aaron their father.
To Aaron were born Nadab, Abihu, Eleazar, and Ithamar. But Nadab and Abihu died when they offered unauthorized fire in the LORD's presence.