Leviticus 1:15; Leviticus 5:8

Leviticus 1:15

15 'The priest shall bring it to the altar, and wring off its head and offer it up in smoke on the altar; and its blood is to be drained out on the side of the altar.

Leviticus 5:8

8 'He shall bring them to the priest, who shall offer first that which is for the sin offering and shall nip its head at the front of its neck, but he shall not sever it.