Nadab and Abihu

"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. So fire went out from the Lord and devoured them, and they died before the Lord. And Moses said to Aaron, “This is what the Lord spoke, saying:"

"Leviticus 10,1-3 (NKJV)."