John Gills Exposition of the Bible Commentary - Leviticus 10:2
And there went out fire from the Lord ,.... They sinned by fire, and they were punished by fire, either from heaven, or from the most holy place, where the Lord dwelt between the cherubim; this was of the nature of lightning, as appears by what follows: and devoured them ; not reduced them to ashes, for neither their bodies nor their clothes were burnt with this fire, as is clear from Leviticus 10:4 but their lives were destroyed, they were lifeless, their souls were separated from... read more
Matthew Henry's Complete Commentary - Leviticus 10:1-2
Here is, I. The great sin that Nadab and Abihu were guilty of: and a great sin we must call it, how little soever it appears in our eye, because it is evident by the punishment of it that it was highly provoking to the God of heaven, whose judgment, we are sure, is according to truth. But what was their sin? All the account here given of it is that they offered strange fire before the Lord, which he commanded them not (Lev. 10:1), and the same Num. 3:4. 1. It does not appear the they had any... read more