Exodus 10:24-26

Then Pharaoh called Moses and said, “Go, serve the LORD; your little ones also may go with you; only let your flocks and your herds remain behind.” But Moses said, “You must also let us have sacrifices and burnt offerings, that we may sacrifice to the LORD our God. Our livestock also must go with us; not a hoof shall be left behind, for we must take of them to serve the LORD our God, and we do not know with what we must serve the LORD until we arrive there.”