Before the Lord. This expression, occurring twice in this verse, seems to stress not so much their unnatural death as the grief of God at the incident.
Strange fire. Literally, “unlawful fire” or “unauthorized fire,” since the word “stranger” in Num. 1:51 means one without credentials. For the reason why it was unlawful, see on Lev. 9:24; 10:1.
They had no children. This fact is not stated in Lev. 10, but is mentioned in 1 Chron. 24:2. Had these two men had children, they, and not Eleazar and Ithamar, would have succeeded Aaron to the high priesthood. All priestly families traced their descent from Eleazar and Ithamar.
In the sight of Aaron. Literally, “at the faces of Aaron,” meaning “during the lifetime of Aaron” (see Gen. 11:28). The descendants of these two men were divided into courses in the time of David as follows: 16 for Eleazar’s offspring and 8 for those of Ithamar (1 Chron. 24:3, 4).