(27) When a bullock, or a sheep, or a goat--The three sacrificial quadrupeds. (See Leviticus 22:19 and Leviticus 17:3-6.)

Is brought forth.--From this expression it was enacted during the second Temple that the animal fit for a sacrifice had to be born naturally. One brought into the world by artificial aid was disqualified for the altar.

It shall be seven days under the dam.--Under seven days the animal is extremely weak, and unfit for human food, and hence must not be offered as the food of God, as sacrifices are called. (See Leviticus 22:25.) For the same reason children could not be circumcised before the eighth day from their birth. (See Exodus 22:29.) Because the text here says that the newly born animal is to be with the dam seven days, it was enacted that if the mother died before the seven days (in which case it could not be with the dam seven days), it was for ever disqualified for a sacrifice.

22:1-33 Laws concerning the priests and sacrifices. - In this chapter we have divers laws concerning the priests and sacrifices, all for preserving the honour of the sanctuary. Let us recollect with gratitude that our great High Priest cannot be hindered by any thing from the discharge of his office. Let us also remember, that the Lord requires us to reverence his name, his truths, his ordinances, and commandments. Let us beware of hypocrisy, and examine ourselves concerning our sinful defilements, seeking to be purified from them in the blood of Christ, and by his sanctifying Spirit. Whoever attempts to expiate his own sin, or draws near in the pride of self-righteousness, puts as great an affront on Christ, as he who comes to the Lord's table from the gratification of sinful lusts. Nor can the minister who loves the souls of the people, suffer them to continue in this dangerous delusion. He must call upon them, not only to repent of their sins, and forsake them; but to put their whole trust in the atonement of Christ, by faith in his name, for pardon and acceptance with God; thus only will the Lord make them holy, as his own people.When a bullock, or a sheep, or a goat, is brought forth,.... Those three are only mentioned, because they were only made use of in sacrifice, to which this law refers:

then it shall be seven days under the dam; whether a calf, or a lamb, or a kid of the goats; it was not to be taken from its dam and killed, either for food or sacrifice, before it was seven days old: Fagius says, the Hebrews give two reasons why a creature might not be offered before the eighth day; one is, that a sabbath might pass over it, nothing being perfect and consistent without it, that giving, as they say (d) perfection and consistence to all the things of the world; and the other, as the heavens and the earth being perfected in seven days, a creature which lives so long seems to be, as it were, perfect; but he observes, if we inquire after the mystical sense of it, a better reason is to be given, namely, that Christ, the type of all the sacrifices, was not to be offered, or suffer death in his infancy, which Herod contrived, but at man's estate; and to show that no man is fit to be a propitiatory sacrifice, through weakness and inability, being unable to stand before the justice of God, only Christ, in whom is perfection of strength:

and from the eighth day and thenceforth it shall be accepted for an offering made by fire unto the Lord; become an acceptable burnt offering to God; so Pliny (e) says, that the young of sheep are fit for sacrifice on the eighth day, and of an ox on the thirtieth day; see Exodus 22:30.

(d) Tzerer Hammor, fol. 104. 2.((e) Nat. Hist. l. 8. c. 51.