Leviticus 22:28-30

BRG Bible

²⁸ And whether it be cow or ewe, ye shall not kill it and her young both in one day.

²⁹ And when ye will offer a sacrifice of thanksgiving unto the Lord, offer it at your own will.

³⁰ On the same day it shall be eaten up; ye shall leave none of it until the morrow: I am the Lord.