Leviticus 10:1-2
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The Sin of Nadab and Abihu
1Now Nadab and Abihu, the sons of Aaron, took their respective firepans, and after putting fire in them, placed incense on the fire and offered strange fire before the Lord, which He had not commanded them. 2And fire came out from the presence of the Lord and consumed them, and they died before the Lord.
Leviticus 10:1-2 (NASB)