1And the LORD called unto Moses, and spake unto him out of the tabernacle of the congregation, saying, 2Speak unto the children of Israel, and say unto them,
If any man of you bring an offering unto the LORD, ye shall bring your offering of the cattle, even of the herd, and of the flock. 3If his offering be a burnt sacrifice of the herd, let him offer a male without blemish: he shall offer it of his own voluntary will at the door of the tabernacle of the congregation before the LORD.
4And he shall put his hand upon the head of the burnt offering; and it shall be accepted for him to make atonement for him. 5And he shall kill the bullock before the LORD: and the priests, Aaron's sons, shall bring the blood, and sprinkle the blood round about upon the altar that is by the door of the tabernacle of the congregation.
6And he shall flay the burnt offering, and cut it into his pieces. 7And the sons of Aaron the priest shall put fire upon the altar, and lay the wood in order upon the fire: 8And the priests, Aaron's sons, shall lay the parts, the head, and the fat, in order upon the wood that is on the fire which is upon the altar: 9But his inwards and his legs shall he wash in water: and the priest shall burn all on the altar, to be a burnt sacrifice, an offering made by fire, of a sweet savour unto the LORD.
-- Leviticus 1:1-9 (KJV)
Leviticus 1:10-13 reiterates this procedure for flock animals.
The sacrificial animals from the herd or flock were cut into parts, with inner parts and legs first being washed with water, then "the priest shall burn all on the altar".