Leviticus 1:17

Then he brought all these to Him and split them into parts down the middle and laid each part opposite the other; but he did not split apart the birds.

‘And he shall bring them to the priest, who shall bring near first that which is for the sin offering and shall nip its head at the front of its neck, but he shall not separate it.

‘The second he shall then prepare as a burnt offering according to the legal judgment. So the priest shall make atonement on his behalf for his sin which he has committed, and it will be forgiven him.

In the porch of the gate were two tables on each side, on which to slaughter the burnt offering, the sin offering and the guilt offering.