Numbers 3:4

But Nadab and Abihu died in the Lord’s presence when they presented unauthorized fire before the Lord in the Wilderness of Sinai, and they had no sons. So Eleazar and Ithamar served as priests under the direction of Aaron their father.

Leviticus 10:1-2

Aaron’s sons Nadab and Abihu each took his own firepan, put fire in it, placed incense on it, and presented unauthorized fire before the Lord, which He had not commanded them to do.

Numbers 26:61

but Nadab and Abihu died when they presented unauthorized fire before the Lord.

Treasury of Scripture Knowledge

Summary

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.

General references

Numbers 26:61

Joshua 21:10

Bible References

General references

but Nadab and Abihu died when they presented unauthorized fire before the Lord.

to the descendants of Aaron from the Kohathite clans of the Levites, because they received the first lot.