Leviticus 22:26-30

Then the Lord spoke to Moses, saying,

“When an ox or a sheep or a goat is born, it shall remain seven days with its mother, and from the eighth day on it will be considered acceptable as a sacrifice of an offering by fire to the Lord.

But, whether it is an ox or a sheep, you shall not slaughter both it and its young in one day.

When you sacrifice a sacrifice of thanksgiving to the Lord, you shall sacrifice it so that you may be accepted.

It shall be eaten on the same day; you shall leave none of it until morning. I am the Lord.