Here are four laws concerning sacrifices: -
I. Whatever was offered in sacrifice to God should be without blemish, otherwise it should not be accepted. This had often been mentioned in the particular institutions of the several sorts of offerings. Now here they are told what was to be accounted a blemish which rendered a beast unfit for sacrifice: if it was blind, or lame, had a wen, or the mange (Lev 22:22), - if it was bruised, or crushed, or broken, or cut (Lev 22:24), that is, as the Jewish writers understand it, if it was, in any of these ways, castrated, if bulls and rams were made into oxen and weathers, they might not be offered. Moreover a difference is made between what was brought as a free-will offering and what was brought as a vow, Lev 22:23. And, though none that had any of the forementioned blemishes might be brought for either, yet if a beast had any thing superfluous or lacking (that is, as the Jews understand it, if there was a disproportion or inequality between those parts that are pairs, when one eye, or ear, or leg, was bigger than it should be, or less than it should be) - if there was no other blemish than this, it might be accepted for a free-will offering, to which a man had not before laid himself, nor had the divine law laid him, under any particular obligation; but for a vow it might not be accepted. Thus God would teach us to make conscience of performing our promises to him very exactly, and not afterwards to abate in quantity or value of what we had solemnly engaged to devote to him. What was, before the vow, in our own power, as in the case of a free-will offering, afterwards is not, Act 5:4. It is again and again declared that no sacrifice should be accepted if it was thus blemished, Lev 22:20, Lev 22:21. According to this law great care was taken to search all the beasts that were brought to be sacrificed, that there might, to a certainty, be no blemish in them. A blemished sacrifice might not be accepted even from the hand of a stranger, though to such all possible encouragement should be given to do honour to the God of Israel, Lev 22:25. By this it appears that strangers were expected to come to the house of God from a far country (Kg1 8:41, Kg1 8:42), and that they should be welcome, and their offerings accepted, as those of Darius, Ezr 6:9, Ezr 6:10; Isa 56:6, Isa 56:7. The heathen priests were many of them not so strict in this matter, but would receive sacrifices for their gods that were ever so scandalous; but let strangers know that the God of Israel would not be so served. Now, 1. This law was then necessary for the preserving of the honour of the sanctuary, and of the God that was there worshipped. It was fit that every thing that was employed for his honour should be the best of the kind; for, as he is the greatest and brightest, so he is the best of beings; and he that is the best must have the best. See how greatly and justly displeasing the breach of this law was to the holy God, Mal 1:8, Mal 1:13, Mal 1:14. 2. This law made all the legal sacrifices the fitter to be types of Christ, the great sacrifice from which all these derived their virtue. In allusion to this law, he is said to be a Lamb without blemish and without spot, Pe1 1:19. As such a priest, so such a sacrifice, became us, who was harmless and undefiled. When Pilate declared, I find no fault in this man, he did thereby in effect pronounce the sacrifice without blemish. The Jews say it was the work of the sagan, or suffragan, high priest, to view the sacrifices, and see whether they were without blemish or no; when Christ suffered, Annas was in that office; but little did those who brought Christ to Annas first, by whom he was sent bound to Caiaphas, as a sacrifice fit to be offered (Joh 18:13, Joh 18:24), think that they were answering the type of this law. 3. It is an instruction to us to offer to God the best we have in our spiritual sacrifices. If our devotions are ignorant, and cold, and trifling, and full of distractions, we offer the blind, and the lame, and the sick, for sacrifice; but cursed be the deceiver that does so, for, while he thinks to put a cheat upon God, he puts a damning cheat upon his own soul.
II. That no beast should be offered in sacrifice before it was eight days old, Lev 22:26, Lev 22:27. It was provided before that the firstlings of their cattle, which were to be dedicated to God, should not be brought to him till after the eighth day, Exo 22:30. Here it is provided that no creature should be offered in sacrifice till it was eight days old complete. Sooner than that it was not fit to be used at men's tables, and therefore not a God's altar. The Jews say, "It was because the sabbath sanctifies all things, and nothing should be offered to God till at least one sabbath had passed over it." It was in conformity to the law of circumcision, which children were to receive on the eighth day. Christ was sacrificed for us, not in his infancy, though then Herod sought to slay him, but in the prime of his time.
III. That the dam and her young should not both be killed in one day, whether in sacrifice or for common use, Lev 22:28. There is such a law as this concerning birds, Deu 22:6. This was forbidden, not as evil in itself, but because it looked barbarous and cruel to the brute creatures; like the tyranny of the king of Babylon, that slew Zedekiah's sons before his eyes, and then put out his eyes. It looked ill-natured towards the species to kill two generations at once, as if one designed the ruin of the kind.
IV. That the flesh of their thank-offerings should be eaten on the same day that they were sacrificed, Lev 22:29, Lev 22:30. This is a repetition of what we had before, Lev 7:15; Lev 19:6, Lev 19:7. The chapter concludes with such a general charge as we have often met with, to keep God's commandments, and not to profane his holy name, Lev 22:31, Lev 22:32. Those that profess God's name, if they do not make conscience of keeping his commandments, do but profane his name. The general reasons are added: God's authority over them - I am the Lord; his interest in them - I am your God; the title he had to them by redemption - "I brought you out of the land of Egypt, on purpose that I might be your God;" the designs of his grace concerning them - I am the Lord that hallow you; and the resolutions of his justice, if he had not honour from them, to get himself honour upon them - I will be hallowed among the children of Israel. God will be a loser in his glory by no man at last; but sooner or later will recover his right, either in the repentance of sinners or in their ruin.

Then he shall put the fifth part thereof unto it - The holy thing of which he has unknowingly eaten shall be fairly valued, and to this value he shall add one fifth more, and give the whole to the priest.

Ye shall offer at your own will,.... For vows and freewill offerings were at their own option, and depended on their own will and pleasure, and when offered should be with a willing mind, and from their whole heart: or "for good will to you"; as the Targums of Onkelos and Jonathan; or for gracious, acceptation, that is, that they might be well pleasing to God, and acceptable in his sight, so Jarchi; in order to which the following direction was strictly to be observed:

a male without blemish, of the beeves, of the sheep, and of the goats; bullocks, sheep, and goats, were the only sorts of beasts, out of which sacrifices were taken, and those that were for burnt offerings were always to be males, and unblemished, see Lev 1:3; but for other offerings, as peace offerings and sin offerings, females might be used, see Lev 3:1. Fowls are not mentioned, though burnt offerings were of them, because it was not required in them, only of beasts, that they should be males, and without blemish; for, as Jarchi observes, these were not rejected on account of a blemish, only for want of a member.

they shall not profane the holy things of the children of Israel--There is some difficulty felt in determining to whom "they" refers. The subject of the preceding context being occupied about the priests, it is supposed by some that this relates to them also; and the meaning then is that the whole people would incur guilt through the fault of the priests, if they should defile the sacred offerings, which they would have done had they presented them while under any defilement [CALVIN]. According to others, "the children of Israel" is the nominative in the sentence; which thus signifies, the children of Israel shall not profane or defile their offerings, by touching them or reserving any part of them, lest they incur the guilt of eating what is divinely appointed to the priests alone [CALMET].