Sons of Aaron, Nadab and Abiu, offer sacrifice. It is rejected; they expire.

Lev 10: 1-2

1 And Nadab and Abiu, the sons of Aaron, taking their censers, put fire therein, and incense on it, offering before the Lord strange fire: which was not commanded them. 2 And fire coming out from the Lord destroyed them: and they died before the Lord.

Num 3: 4

4 Now Nadab and Abiu died, without children, when they offered strange fire before the Lord, in the desert of Sinai