Exodus 10:21-29 - Plague Nine: Darkness
21 The Lord said to Moses, "Extend your hand toward heaven so that there may be darkness over the land of Egypt, a darkness so thick it can be felt." 22 So Moses extended his hand toward heaven, and there was absolute darkness throughout the land of Egypt for three days. 23 No one could see another person, and no one could rise from his place for three days. But the Israelites had light in the places where they lived.
24 Then Pharaoh summoned Moses and said, "Go, serve the Lord -- only your flocks and herds will be detained. Even your families may go with you."
25 But Moses said, "Will you also provide us with sacrifices and burnt offerings that we may present them to the Lord our God? 26 Our livestock must also go with us! Not a hoof is to be left behind! For we must take these animals to serve the Lord our God. Until we arrive there, we do not know what we must use to serve the Lord."
27 But the Lord hardened Pharaoh's heart, and he was not willing to release them. 28 Pharaoh said to him, "Go from me! Watch out for yourself! Do not appear before me again, for when you see my face you will die!"
29 Moses said, "As you wish! I will not see your face again."