Exodus 10:22-24

Young's Literal Translation

²² And Moses stretcheth out his hand towards the heavens, and there is darkness -- thick darkness in all the land of Egypt three days;

²³ they have not seen one another, and none hath risen from his place three days; and to all the sons of Israel there hath been light in their dwellings.'

²⁴ And Pharaoh calleth unto Moses and saith, `Go ye, serve Jehovah, only your flock and your herd are stayed, your infants also go with you;'