Leviticus 22:26-30

26And the Lord said to Moses,

27“When a calf or lamb or goat is born, it must be left with its mother for seven days. From the eighth day on, it will be acceptable as a special gift to the Lord.

28But you must not slaughter a mother animal and her offspring on the same day, whether from the herd or the flock.

29When you bring a thanksgiving offering to the Lord, sacrifice it properly so you will be accepted.

30Eat the entire sacrificial animal on the day it is presented. Do not leave any of it until the next morning. I am the Lord.