When Aaron presents the bull for his sin offering and makes atonement for himself and his household, he is to slaughter the bull for his own sin offering.
KJV
And Aaron shall bring the bullock of the sin offering, which [is] for himself, and shall make an atonement for himself, and for his house, and shall kill the bullock of the sin offering which [is] for himself:
ASV
And Aaron shall present the bullock of the sin-offering, which is for himself, and shall make atonement for himself, and for his house, and shall kill the bullock of the sin-offering which is for himself.