25“Speak to Aaron and his sons, saying, This is the law of the sin offering. In the place where the burnt offering is killed shall the sin offering be killed before the LORD; it is most holy.
The animal was killed to signify that the penalty of death had been carried out.
25 “Speak to Aaron and his sons, saying, This is the law of the sin offering. In the place where the burnt offering is killed shall the sin offering be killed before the LORD; it is most holy.