Leviticus 10:1

Now Nadab and Abihu , the sons of Aaron , each took his censer and put fire in it and laid incense on it and offered unauthorized fire before the Lord , which he had not commanded them.

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.

And Nadab and Abihu, the sons of Aaron, took either of them his censer, and put fire therein, and put incense thereon, and offered strange fire before the Lord, which he commanded them not.