Vayikra 10:1-2 Orthodox Jewish Bible (OJB)
10 And Nadav and Avihu, the bnei Aharon, each took his censer, and put eish therein, and put ketoret (incense) thereon, and offered eish zarah (strange, unauthorized fire) before Hashem, which He commanded them not.
2 And there went out eish (fire) from the presence of Hashem, and devoured them, and they died before Hashem.
Leviticus 10:1-2 New International Version (NIV)
The Death of Nadab and Abihu
10 Aaron’s sons Nadab and Abihu took their censers, put fire in them and added incense; and they offered unauthorized fire before the Lord, contrary to his command. 2 So fire came out from the presence of the Lord and consumed them, and they died before the Lord.