Leviticus 10:1-7 (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. 2 So fire went out from the Lord and devoured them, and they died before the Lord. 3 And Moses said to Aaron, “This is what the Lordspoke, saying:
‘By those who come near Me
I must be regarded as holy;
And before all the people
I must be glorified.’”
So Aaron held his peace.
4 Then Moses called Mishael and Elzaphan, the sons of Uzziel the uncle of Aaron, and said to them, “Come near, carry your brethren from before the sanctuary out of the camp.” 5 So they went near and carried them by their tunics out of the camp, as Moses had said.
6 And Moses said to Aaron, and to Eleazar and Ithamar, his sons, “Do not uncover your heads nor tear your clothes, lest you die, and wrath come upon all the people. But let your brethren, the whole house of Israel, bewail the burning which the Lord has kindled. 7 You shall not go out from the door of the tabernacle of meeting, lest you die, for the anointing oil of the Lord is upon you.” And they did according to the word of Moses.