Ex 29:10
and Aaron and his sons laid their hands upon the head of the bullock for the sin [offering]; their right hands, according to the Targum of Jonathan, which is not improbable, thereby as it were transferring their sins to it, and confessing them over it; acknowledging their guilt, and that they deserved to die, as that creature would, which was to be a vicarious sacrifice for sin, and whose blood was to purify and sanctify the altar, at which they, sinful men, were to serve.