Leviticus 10:1 New King James Version (NKJV)
The Profane Fire of Nadab and Abihu
10 Then 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.
Leviticus 10:1 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.