Adam Clarke on Leviticus 10:19

And such things have befallen me, etc. - The excuse which Aaron makes for not feasting on the sin-offering according to the law is at once appropriate and dignified; as if he had said: "God certainly has commanded me to eat of the sin-offering; but when such things as these have happened unto me, could it be good in the sight of the Lord? Does he not expect that I should feel as a father under such afflicting circumstances?" With this spirited answer Moses was satisfied; and God, who knew his situation, took no notice of the irregularity which had taken place in the solemn service. To human nature God has given the privilege to weep in times of affliction and distress. In his infinite kindness he has ordained that tears, which are only external evidences of our grief, shall be the outlets to our sorrows, and tend to exhaust the cause from which they flow. See on Lev 10:3 (note).