Leviticus 22:28-32

And whether it be cow or ewe, ye shall not kill it and her young both in one day.

And when ye will offer a sacrifice of thanksgiving unto the LORD, offer it at your own will.

On the same day it shall be eaten up; ye shall leave none of it until the morrow: I am the LORD.

Therefore shall ye keep my commandments, and do them: I am the LORD.

Neither shall ye profane my holy name; but I will be hallowed among the children of Israel: I am the LORD which hallow you,