In Leviticus 10:1-3, men, who were to approach God on behalf of the children of Israel, were to come on His terms. He killed them because they neglected to do as they were instructed. They were supposed to get the fire for their censers from the brazen altar, where the sacrifices or “sin offerings” were made. Any sinner wanting to approach God must do so on His terms—through repentance and faith in Jesus. Those who refuse to obey God will be destroyed by fire: “…when the Lord Jesus is revealed from heaven with His mighty angels, in flaming fire taking vengeance on those who do not know God, and on those who do not obey the gospel of our Lord Jesus Christ. These shall be punished with everlasting destruction from the presence of the Lord and from the glory of His power” (2 Thess. 1:7–9).
Leviticus 10:1 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 Lord spoke, 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.