Exodus 10:21-26

The Plague of Darkness 21Then the LORD said to Moses, “Stretch out your hand toward the sky so that darkness spreads over Egypt—darkness that can be felt.” 22So Moses stretched out his hand toward the sky, and total darkness covered all Egypt for three days.

23No one could see anyone else or move about for three days. Yet all the Israelites had light in the places where they lived.

24Then Pharaoh summoned Moses and said, “Go, worship the LORD . Even your women and children may go with you; only leave your flocks and herds behind.” 25But Moses said, “You must allow us to have sacrifices and burnt offerings to present to the LORD our God.

26Our livestock too must go with us; not a hoof is to be left behind. We have to use some of them in worshiping the LORD our God, and until we get there we will not know what we are to use to worship the LORD .”