Exodus 10:24-26

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