Midrasz do Kapłańska 9:3

(Lev. 9:1) “And it came to pass on the eighth day….” This text is related to [the verse] (in Eccl. 8:5), “Whoever observes a commandment shall not know anything evil.” Who is this?¹Cf. Tanh. (Buber), Gen. 2:4. Aaron, of whom it is said (in Lev. 8:33, 35), “And you (i.e., you and your sons) shall not go out from the door of the tent of meeting for seven days […]. And you shall remain at the door of the tent of meeting day and night for seven days.” Moses said to them, “Observe mourning for seven days, before it comes to you.” (Lev. 8:35, cont.) “And you shall observe the charge of the Lord.” Moses said to them, “Observe the charge of the Lord, for so did the Holy One, blessed be He, observe seven days of mourning before He brought the flood.” Where is it shown that He mourned [before the flood]? Where it is stated (in Gen. 6:6), “Then the Lord regretted that He had made humanity on the earth, and He was grieving in his heart.” [The expression] “He was grieving” can only mean, He mourned. For so it says concerning David (in II Sam. 19:3), “And the victory [on that day] was turned into mourning for all the people because [on that day they heard it being said,] ‘The king was grieving over his son.’”²Tanh. (Buber), Gen. 2:4; Gen. R. 27:4. So also Ezra said to Israel when they were weeping, each one for his brother and each one for his child (in Neh. 8:10), “Go, eat choice foods and drink sweet drinks…. Do not be grieving, for the joy of the Lord is your strength.” It is therefore stated (in Gen. 6:6), “and He was grieving in his heart.” At that time the Holy One, blessed be He, observed the seven days of mourning, before He brought the flood. Thus it is stated (in Gen. 7:10), “And it came to pass after seven days [that the waters of the flood came upon the earth].” And so Moses was saying to Aaron the priest and to his sons, “Just as the Holy One, blessed be He, mourned over His world before He brought the flood, so [you are to] observe the [required] mourning before it touches (i.e., harms) you.” So they observed [the mourning], but they did not know for what reason they were observing it. Why? (Eccl. 8:5:) “Whoever observes a commandment shall not know anything evil.” (Eccl. 8:5, cont.:) “And a wise heart shall know [there is] a time of judgment.” This is Moses, to whom the Holy One, blessed be He, had already said (in Exod. 29:43), “And there I will meet with the Children of Israel, and there shall be sanctification³This translation leaves in doubt who or what is sanctified. A more traditional translation would read, “It (i.e., the door of the Tabernacle) shall be sanctified.” through My glory.” [In other words,] I (the Holy One, blessed be He,) will be sanctified there through My glory. Now Moses ministered during the seven days of priestly ordination, but he was afraid, saying, “Perhaps divine judgment will strike him (i.e., Aaron).” Thus it is stated (ibid.), “and there shall be sanctification through My glory.” Still he did not act, but said to Aaron, “Observe seven days of mourning.” [Aaron] said to him, “Why?” [Moses] said to him, “For so the Holy One, blessed be He, has told me – (in Lev. 8:35) “for so I have been commanded.” When they had observed the seven days of mourning and [when] the eighth day had come, Nadab and Abihu went in to make an offering (rt.: qrb). Divine judgment struck them, and they were destroyed by fire. It is so stated (in Lev. 10:2), “So fire came forth from before the Lord and consumed them, so that they died before the Lord.” Moses came and said to Aaron (in Lev. 10:3), “This is what the Lord spoke, ‘Through those who are near (rt.: qrb) to Me, I will be sanctified.” Where did he speak? In the Sinai Desert. (Exod. 29:43), “And there I will meet with the Children of Israel, and there shall be sanctification through My glory.” And so did Moses say to Aaron, “The time that He said to me, ‘Through those who are near to Me, I will be sanctified,’ I thought that He would strike me or you. But now I know that they are greater than I and than you.” (Lev 9:3:) “And Aaron was silent” – the thing was consolation for him. Ergo (Eccl. 8:5), “Whoever observes a commandment shall not know anything evil.”

3) (Vayikra 9:2): "And he said to Aaron: Take for yourself a bull-calf for a sin-offering": We are hereby taught that Moses said to Aaron: Aaron, my brother, even though the Holy One Blessed be He has consented to forgive your sins (in the episode of the golden calf), you must "place something in Satan's mouth." Send your gift before you before entering the sanctuary lest he condemn you upon your entering the sanctuary. And lest you say: Is it only I who need atonement? Israel, too, needs atonement, viz. (Vayikra 9:3): "And to the children of Israel shall you speak, saying: Take a kid of goats for a sin-offering, and a calf, etc." And why was it Israel's lot to bring more than Aaron? He said to them: You are culpable in the beginning and culpable in the end. In the beginning (at the sale of Yosef) — (Bereshith 37:31): "And they slaughtered a kid of goats, etc."; in the end — (Shemoth 32:8): "They have made for themselves a molten calf." Let a kid of goats come and atone for the "act" of goats, let a calf come and atone for the "act" of the calf.

(Lev. 9:2:) “Then he said unto Aaron, ‘Take a calf [of the herd for a sin offering].’” Why was it not told him [to take] a bull instead of a calf? He said to him, “Because through the calf (of Exod. 32) the priesthood was shaken in your hand, through a calf it is being established in your hand.” And not only that, but lest Israel say there are sins [clinging] to them from the deed of the calf, for that reason He said they should offer a calf [for a sin offering]. Thus it is stated (in Lev. 9:3), “And you shall speak unto the Children of Israel, saying, ‘Take a male goat for a sin offering and a calf….’” [These things were said] so that they would know that they had been forgiven for the deed of the calf. The Holy One, blessed be He, said to them, “In this world, they have been forgiven through offerings, but in the world to come I will wipe away their sins without an offering.” It is so stated (in Is. 43:25), “I, even I, will pardon¹²Mohel; cf. the Masoretic Text which reads moheh (“wipe away”). your transgressions for My own sake and will not remember your sins.”