Leviticus 1:9, 15

but its inwards and its legs shall he wash with water. And the priest shall burn the whole on the altar, for a burnt-offering, an offering made by fire, of a sweet savor unto Jehovah.

And the priest shall bring it unto the altar, and wring off its head, and burn it on the altar; and the blood thereof shall be drained out on the side of the altar