Leviticus 1:9

1:9 Finally, the one presenting the offering must wash its entrails and its legs in water and the priest must offer all of it up in smoke on the altar – it is a burnt offering, a gift of a soothing aroma to the Lord.

Leviticus 1:15

1:15 The priest must present it at the altar, pinch off its head and offer the head up in smoke on the altar, and its blood must be drained out against the side of the altar.