Exodus 10:20-23
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20 But the LORD hardened Pharaoh's heart, so that he would not let the children of Israel go.
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21 And the LORD said unto Moses, Stretch out thine hand toward heaven, that there may be darkness over the land of Egypt, even darkness which may be felt.
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22 And Moses stretched forth his hand toward heaven; and there was a thick darkness in all the land of Egypt three days:
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23 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.