Leviticus 10:1-2
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1Nadab and Abihu, the sons of Aaron, took each of them his censer, and put fire therein, and laid incense thereon, and offered strange fire before Yahweh, which he had not commanded them. 2There came forth fire from before Yahweh, and devoured them, and they died before Yahweh.
Leviticus 10:1-2 (WEB)