Moses repeateth and re-enforceth the former command, partly lest their great loss and grief should cause them to forget or neglect their meat prescribed them by God, which abstinence would have been both a signification of their sorrow, which God had forbidden them, and a new transgression of a Divine precept; and partly to encourage them to go on in their holy services, and not to be dejected for the late severity, as if God would no more accept them or their sacrifices.
Related Commentaries of Leviticus 10:12
Leviticus 10:12
12 And Moses spake unto Aaron, and unto Eleazar and unto Ithamar, his sons that were left, Take the meat offering that remaineth of the offerings of the LORD made by fire, and eat it without leaven beside the altar: for it is most holy: