Bribing Satan

 Sifra (Shemini Introduction) "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 G-d 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, "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  "And they slaughtered a kid of goats, etc."; in the end "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.