Sammael said before the Holy One, blessed be He: Sovereign of all the universe! Thou hast given me power over all the nations of the world, but over Israel Thou hast not given me power. He answered him, saying: Behold, thou hast power over them on the Day of Atonement if they have any sin, but if not, thou hast no power over them. Therefore they gave him a present on the Day of Atonement, in order that they should not bring their offering, as it is said, "One lot for the Lord, and the other lot for Azazel" (Lev. 16:8).
Blessing of Sammael
Pirkei DeRabbi Eliezer 46:8