Leviticus 22:28

The command not to kill an ox or sheep at the same time as its young is related to the law in Exo 23:19 and Deu 22:6-7, and was intended to lay it down as a duty on the part of the Israelites to keep sacred the relation which God had established between parent and offspring. - In Lev 22:29, Lev 22:30, the command to eat the flesh of the animal on the day on which it was offered (Lev 7:15; Lev 19:5-6) is repeated with special reference to the praise-offering.

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.).

22:28 on the same day: There are several possible explanations for this command, although none is certain: (1) Senseless slaughtering would leave nothing of the herd; (2) it would be inhumane to slaughter the young and the mother at the same time; or (3) it would be too similar to pagan worship rites, where the newborn animal was cooked in the milk of its slain mother (see Exod 23:19).