Exodus 10:21-23

21And Jehovah saidH559 to MosesH4872, StretchH5186 out thy handH3027 toward the heavensH8064, that there may beH1961 darknessH2822 in the landH776 of EgyptH4714 — so that one may feelH4959 darknessH2822.

22And MosesH4872 stretchedH5186 out his handH3027 toward the heavensH8064; and there wasH1961 a thick darknessH2822 throughout the landH776 of EgyptH4714 threeH7969 daysH3117:

23they sawH7200 not oneH376 another, neither roseH6965 any from his placeH8478, for threeH7969 daysH3117. But all the children of IsraelH3478 had lightH216 in their dwellingsH4186.