וַיִּקְרַ֥ב אַהֲרֹ֖ן אֶל־הַמִּזְבֵּ֑חַ וַיִּשְׁחַ֛ט אֶת־עֵ֥גֶל הַחַטָּ֖את אֲשֶׁר־לֽוֹ׃
So Aaron drew near unto the altar, and slew the calf of the sin-offering, which was for himself.
Targum Jonathan on Leviticus
And Aharon approached to the altar with resolution, and slew the calf for his own sin offering.