On the head To testify both his acknowledgment of his sin, and faith in God's promise for the expiation of his sins through Christ, whom that sacrifice typified.
Related Commentaries of Leviticus 4:4
Leviticus 4:4
4 And he shall bring the bullock unto the door of the tabernacle of the congregation before the LORD; and shall lay his hand upon the bullock's head, and kill the bullock before the LORD.