Leviticus 1:7-9

1:7 and the sons of Aaron, the priest, must put fire on the altar and arrange wood on the fire. 1:8 Then the sons of Aaron, the priests, must arrange the parts with the head and the suet on the wood that is in the fire on the altar. 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.