Exodus 10:24-26

24Pharaoh summoned Moses and said, “Go, worship the Lord. Even your families may go with you; only your flocks and herds must stay behind.”

25Moses responded, “You must also let us have sacrifices and burnt offerings to prepare for the Lord our God.

26Even our livestock must go with us; not a hoof will be left behind because we will take some of them to worship the Lord our God. We will not know what we will use to worship the Lord until we get there.”