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 Leviticus 10:3 (note).

this day

Leviticus 9:8,12 Aaron therefore went to the altar, and slew the calf of the sin offering, which was for himself...

Hebrews 7:27 Who needs not daily, as those high priests, to offer up sacrifice, first for his own sins, and then for the people's...

Hebrews 9:8 The Holy Ghost this signifying, that the way into the holiest of all was not yet made manifest...

should

Deuteronomy 12:7 And there you shall eat before the LORD your God, and you shall rejoice in all that you put your hand to, you and your households...

Deuteronomy 26:14 I have not eaten thereof in my mourning, neither have I taken away ought thereof for any unclean use...

1 Samuel 1:7,8 And as he did so year by year, when she went up to the house of the LORD, so she provoked her; therefore she wept, and did not eat...

Isaiah 1:11,15 To what purpose is the multitude of your sacrifices to me? said the LORD: I am full of the burnt offerings of rams...

Jeremiah 6:20 To what purpose comes there to me incense from Sheba, and the sweet cane from a far country? your burnt offerings are not acceptable...

Jeremiah 14:12 When they fast, I will not hear their cry; and when they offer burnt offering and an oblation, I will not accept them...

Hosea 9:4 They shall not offer wine offerings to the LORD, neither shall they be pleasing to him...

Malachi 1:10 Who is there even among you that would shut the doors for nothing? neither do you kindle fire on my altar for nothing...

Malachi 1:13 You said also, Behold, what a weariness is it! and you have snuffed at it, said the LORD of hosts; and you brought that which was torn...

Malachi 2:13 And this have you done again, covering the altar of the LORD with tears, with weeping, and with crying out...

Philippians 4:4 Rejoice in the Lord always: and again I say, Rejoice.

Brief Directions How to Read the Holy Scriptures once Every Year Over, with Ease, Profit, and Reverence.
But forasmuch, that as faith is the soul, so reading and meditating on the word of God, are the parent's of prayer, therefore, before thou prayest in the morning, first read a chapter in the word of God; then meditate awhile with thyself, how many excellent things thou canst remember out of it. As--First, what good counsels or exhortations to good works and to holy life. Secondly, what threatenings of judgments against such and such a sin; and what fearful examples of God's punishment or vengeance …
Lewis Bayly—The Practice of Piety