The Lord calls Moses and speaks to him from the tent of meeting. He tells him to instruct the Israelites about what to do when someone wants to bring an offering from the herd or the flock. The whole chapter describes the burnt offering, which is burned completely on the altar.
If the offering is from the herd, it must be a male bull without blemish, brought to the entrance of the tent so that it may be accepted. The worshiper lays his hand on the animal's head, and it is accepted to make atonement for him. He then slaughters the bull, the priests, the sons of Aaron, splash the blood around the altar, and the worshiper skins and cuts up the animal. The priests arrange the pieces on the fire, and the entrails and legs are washed with water.
The same pattern holds for someone who offers a sheep or a goat from the flock, slaughtered on the north side of the altar, and for someone with fewer means: turtledoves or young pigeons. The priest wrings off the bird's head, burns it and removes the crop and feathers. In all three cases the closing phrase is the same: it is an offering with a pleasing aroma to the Lord.