Exodus 10:25-27

New Revised Standard Version, Anglicised Catholic Edition

²⁵ But Moses said, ‘You must also let us have sacrifices and burnt-offerings to sacrifice to the Lord our God. ²⁶ Our livestock also must go with us; not a hoof shall be left behind, for we must choose some of them for the worship of the Lord our God, and we will not know what to use to worship the Lord until we arrive there.’ ²⁷ But the Lord hardened Pharaoh’s heart, and he was unwilling to let them go.