Leviticus 10:1-3

1 That same day Nadab and Abihu, Aaron's sons, took their censers, put hot coals and incense in them, and offered "strange" fire to God - something God had not commanded.
2 Fire blazed out from God and consumed them - they died in God's presence.
3 Moses said to Aaron, "This is what God meant when he said, To the one who comes near me, I will show myself holy; Before all the people, I will show my glory." Aaron was silent.
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