Leviticus 22:28-30

New Revised Standard Version, Anglicised Catholic Edition

²⁸ But you shall not slaughter, from the herd or the flock, an animal with its young on the same day. ²⁹ When you sacrifice a thanksgiving-offering to the Lord, you shall sacrifice it so that it may be acceptable in your behalf. ³⁰ It shall be eaten on the same day; you shall not leave any of it until morning: I am the Lord.