Read: Leviticus 10:1-10
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. So fire came out from the presence of the Lord and consumed them, and they died before the Lord. Lev 10:1-2
The very same Shekinah which had consumed the sacrifice now flashes out again to destroy these two priests. What a shock this must have been to Aaron, to his remaining two sons, and to the whole camp of Israel.
What do you think your reaction would have been if you had been part of this scene? Many of us reading stories like this have come up with the idea that God, especially the God of the Old Testament, is a God of vengeful judgment. But God is acting here just as much as a God of love as he is in any other part of the Bible. His nature is love. And he never deviates from what he has revealed himself to be. So this action must be in line with his nature and character of love.
There are several features in this passage which help us: The first is that this sin on the part of these two priests was not a sin of ignorance but one of presumption. They knew better. It wasn’t that they were simply doing something at which they had no idea God would be offended. They had been told emphatically that he would be offended. In Exodus 30:7-9 God had precisely said, Be careful; do not offer the wrong kind of incense. So this was a violation of the direct command of God. God never visits with judgment anybody who is struggling in ignorance to try to find him.