Reference for Exodus 10:21

וַיֹּ֨אמֶר יְהוָ֜ה אֶל־מֹשֶׁ֗ה נְטֵ֤ה יָֽדְךָ֙ עַל־הַשָּׁמַ֔יִם וִ֥יהִי חֹ֖שֶׁךְ עַל־אֶ֣רֶץ מִצְרָ֑יִם וְיָמֵ֖שׁ חֹֽשֶׁךְ׃

And the LORD said unto Moses: ‘Stretch out thy hand toward heaven, that there may be darkness over the land of Egypt, even darkness which may be felt.’

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