Exodus 10:21-29

And the LORD said to Moses, Stretch out your hand toward heaven, that there may be darkness over the land of Egypt, even darkness which may be felt. And Moses stretched forth his hand toward heaven; and there was a thick darkness in all the land of Egypt three days: They saw not one another, neither rose any from his place for three days: but all the children of Israel had light in their dwellings. And Pharaoh called to Moses, and said, Go you, serve the LORD; only let your flocks and your herds be stayed: let your little ones also go with you. And Moses said, You must give us also sacrifices and burnt offerings, that we may sacrifice to the LORD our God. Our cattle also shall go with us; there shall not an hoof be left behind; for thereof must we take to serve the LORD our God; and we know not with what we must serve the LORD, until we come thither. But the LORD hardened Pharaoh’s heart, and he would not let them go. And Pharaoh said to him, Get you from me, take heed to yourself, see my face no more; for in that day you see my face you shall die. And Moses said, You have spoken well, I will see your face again no more.