Shemot 10:21-23

Orthodox Jewish Bible

²¹ And Hashem said unto Moshe, Stretch out thine yad toward Shomayim, that there may be choshech over Eretz Mitzrayim, even choshech which he can feel.

²² And Moshe stretched forth his yad toward Shomayim; and there was a thick choshech in kol Eretz Mitzrayim shloshet yamim;

²³ They saw not one another, neither rose any from his place for shloshet yamim; but kol Bnei Yisroel had Ohr in their dwellings.