Leviticus 1

5. he shall kill the bullock--The animal should be killed by the offerer, not by the priest, for it was not his duty in case of voluntary sacrifices; in later times, however, the office was generally performed by Levites.
before the Lord--on the spot where the hands had been laid upon the animal's head, on the north side of the altar.
sprinkle the blood--This was to be done by the priests. The blood being considered the life, the effusion of it was the essential part of the sacrifice; and the sprinkling of it--the application of the atonement--made the person and services of the offerer acceptable to God. The skin having been stripped off, and the carcass cut up, the various pieces were disposed on the altar in the manner best calculated to facilitate their being consumed by the fire.

8. the fat--that about the kidneys especially, which is called "suet."

9. but his inwards and his legs shall he wash in water--This part of the ceremony was symbolical of the inward purity, and the holy walk, that became acceptable worshippers.
a sweet savour unto the Lord--is an expression of the offerer's piety, but especially as a sacrificial type of Christ.

10-13. if his offering be of the flocks--Those who could not afford the expense of a bullock might offer a ram or a he-goat, and the same ceremonies were to be observed in the act of offering.

14-17. if the burnt sacrifice . . . be of fowls--The gentle nature and cleanly habits of the dove led to its selection, while all other fowls were rejected, either for the fierceness of their disposition or the grossness of their taste; and in this case, there being from the smallness of the animal no blood for waste, the priest was directed to prepare it at the altar and sprinkle the blood. This was the offering appointed for the poor. The fowls were always offered in pairs, and the reason why Moses ordered two turtledoves or two young pigeons, was not merely to suit the convenience of the offerer, but according as the latter was in season; for pigeons are sometimes quite hard and unfit for eating, at which time turtledoves are very good in Egypt and Palestine. The turtledoves are not restricted to any age because they are always good when they appear in those countries, being birds of passage; but the age of the pigeons is particularly marked that they might not be offered to God at times when they are rejected by men [HARMER]. It is obvious, from the varying scale of these voluntary sacrifices, that the disposition of the offerer was the thing looked to--not the costliness of his offering.