Leviticus 10:1-2

Darby Translation

10 And the sons of Aaron, Nadab and Abihu, took each of them his censer, and put fire in it, and put incense on it, and presented strange fire before Jehovah, which he had not commanded them.

² And there went out fire from before Jehovah, and devoured them, and they died before Jehovah.