Albert Barnes Commentary Leviticus 10:2

"And there came forth fire from before Jehovah, and devoured them, and they died before Jehovah." — Leviticus 10:2 (ASV)

The fire which had just before sanctified the ministry of Aaron as well pleasing to God, now brought to destruction his two eldest sons because they did not sanctify Yahweh in their hearts, but dared to perform a self-willed act of worship; just as the same Gospel is to one a savor of life unto life, and to another a savor of death unto death (2 Corinthians 2:16).