Exodus 10:20-22

Darby Translation

²⁰ And Jehovah made Pharaoh's heart stubborn, and he did not let the children of Israel go.

²¹ And Jehovah said to Moses, Stretch out thy hand toward the heavens, that there may be darkness in the land of Egypt—so that one may feel darkness.

²² And Moses stretched out his hand toward the heavens; and there was a thick darkness throughout the land of Egypt three days: