Leviticus 10:1

And Aaron took Elisheba, the daughter of Amminadab, the sister of Nahshon, as a wife, and she bore him Nadab and Abihu, Eleazar and Ithamar.

Then He said to Moses, “Come up to Yahweh, you and Aaron, Nadab and Abihu and seventy of the elders of Israel, and you all shall worship at a distance.

Now Yahweh spoke to Moses after the death of the two sons of Aaron, when they came near the presence of Yahweh and died.

“And he shall take a firepan full of coals of fire from upon the altar before Yahweh and two handfuls of finely ground fragrant incense, and bring it inside the veil.

But Nadab and Abihu died before Yahweh when they offered strange fire before Yahweh in the wilderness of Sinai; and they had no children. So Eleazar and Ithamar ministered as priests in the lifetime of their father Aaron.

But Nadab and Abihu died when they offered strange fire before Yahweh.

Then the fire of Yahweh fell and consumed the burnt offering and the wood and the stones and the dust, and licked up the water that was in the trench.

Nadab and Abihu Offer Strange Fire