Leviticus 10:1-2
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The Profane Fire of Nadab and Abihu
1Then Nadab and Abihu, the sons of Aaron, each took his censer and put fire in it, put incense on it, and offered profane fire before the Lord, which He had not commanded them. 2So fire went out from the Lord and devoured them, and they died before the Lord.
Leviticus 10:1-2 (NKJV)