Matthew Henry on Leviticus 10:3-7
We may well think that when Nadab and Abihu were struck with death all about them were struck with horror, and every face, as well as theirs, gathered blackness. Great consternation, no doubt, seized them, and they were all full of confusion; but, whatever the rest were, Moses was composed, and knew what he said and did, not being displeased, as David was in a like case, Sa2 6:8. But though it touched him in a very tender part, and was a dreadful damp to one of the greatest joys he ever knew, yet he kept possession of his own soul, and took care to keep good order and a due decorum in the sanctuary.
I. He endeavours to pacify Aaron, and to keep him in a good frame under this sad dispensation…
Read the whole note in the consoleJamieson-Fausset-Brown on Leviticus 10:6
Uncover not your heads--They who were ordered to carry out the two bodies, being engaged in their sacred duties, were forbidden to remove their turbans, in conformity with the usual customs of mourning; and the prohibition "neither rend your garments," was, in all probability, confined also to their official costume. For at other times the priests wore the ordinary dress of their countrymen and, in common with their families, might indulge their private feelings by the usual signs or expressions of grief.
Adam Clarke on Leviticus 10:6
Uncover not your heads, etc. - They were to use no sign of grief or mourning,
1. Because those who were employed in the service of the sanctuary should avoid every thing that might incapacitate them for that service; and,
2. Because the crime of their brethren was so highly provoking to God, and so fully merited the punishment which he had inflicted, that their mourning might be considered as accusing the Divine justice of undue severity.
John Gill on Leviticus 10:6
And Moses said unto Aaron, and unto Eleazar, and unto Ithamar, his sons,.... His two younger sons, which yet remained; and so the Septuagint version adds, as in Leviticus 10:12.
uncover not your heads; that is, do not take off your mitre, as the Septuagint version; or the bonnets which they wore in the time of their ministry; for the Jewish priests always had their mitres and bonnets on when they sacrificed; in imitation of which, the Heathens had their heads covered when they offered their sacrifices (k): now it was the way, or custom of a mourner, as Ben Melech observes, to remove his mitre, bonnet, or tiara, from his head; but in this case, that no sign of mourning might be shown, Aaron…