3. Mose 22:27

A young ox, sheep, or goat was to be seven days under its mother, and could only be sacrificed from the eighth day onwards, according to the rule laid down in Exo 22:29 with regard to the first-born. The reason for this was, that the young animal had not attained to a mature and self-sustained life during the first week of its existence. (Note: For this reason the following rule was also laid down by the Romans: Suis faetus sacrificio die quinto purus est, pecoris die octavo, bovis tricesimo (Plin. h. n. 8, 51).) This maturity was not reached till after the lapse of a week, that period of time sanctified by the creation. There is no rule laid down in the law respecting the age up to which an animal was admissible in sacrifice. Bullocks, i.e., steers or young oxen of more than a year old, are frequently mentioned and prescribed for the festal sacrifices (for the young ox of less than a year old is called עגל; Lev 9:3), viz., as burnt-offerings in Lev 23:18; Num 7:15, Num 7:21, Num 7:27, Num 7:33, Num 7:39.; Num 8:8; Num 15:24; Num 28:11, Num 28:19, Num 28:27; Num 29:2, Num 29:8, and as sin-offerings in Lev 4:3, Lev 4:14; Lev 16:3; - sheep (lambs) of one year old are also prescribed as burnt-offerings in Lev 9:3; Lev 12:6; Lev 23:12; Exo 29:38; Num 6:14; Num 7:17, Num 7:21, Num 7:27, Num 7:33, Num 7:39., Num 28:3, Num 28:9, Num 28:19, Num 28:27; Num 29:2, Num 29:8, Num 29:13, Num 29:17., as peace-offerings in Num 7:17, Num 7:23; Num 29:35., and as trespass-offerings in Num 6:12; also a yearling ewe as a sin-offering in Lev 14:10 and Num 6:14, and a yearling goat in Num 15:27. They generally brought older oxen or bullocks for peace-offerings (Num 7:17; Num 23:29.), and sometimes as burnt-offerings. In Jdg 6:25 an ox of seven years old is said to have been brought as a burn…

In this chapter we have divers laws concerning the priests and sacrifices all for the preserving of the honour of the sanctuary. I. That the priests should not eat the holy things in their uncleanness (Lev 22:1-9). II. That no stranger who did not belong to some family of the priests should eat of the holy things (Lev 22:10-13), and, if he did it unwittingly, he must make restitution, (Lev 22:14-16). III. That the sacrifices which were offered must be without blemish (Lev 22:17-25). IV. That they must be more than eight days old (Lev 22:26-28), and that the sacrifices of thanksgiving must be eaten the same day they were offered (Lev 22:29, etc.).

22:27 Leaving a newborn animal with its mother for seven days allowed time to determine the animal’s health (see Exod 22:30).