Leviticus 22:28-30

New International Version - UK

²⁸ Do not slaughter a cow or a sheep and its young on the same day.

²⁹ ‘When you sacrifice a thank-offering to the Lord, sacrifice it in such a way that it will be accepted on your behalf. ³⁰ It must be eaten that same day; leave none of it till morning. I am the Lord.