Why did Aaron and his sons lay their hands on the bull?
Lévitique 8:14 (NEG79)
14Il fit approcher le taureau expiatoire, et Aaron et ses fils posèrent leurs mains sur la tête du taureau expiatoire.
The first thing that the priests did when sacrificing the bull as sin offering was laying their hands on the animal. This symbolized the transference of the sin from the priests to the animal.
14 Il fit approcher le taureau expiatoire, et Aaron et ses fils posèrent leurs mains sur la tête du taureau expiatoire.