Exodus 10:22-24 American Standard Version (ASV)

22. And Moses stretched forth his hand toward heaven; and there was a thick darkness in all the land of Egypt three days;

23. they saw not one another, neither rose any one from his place for three days: but all the children of Israel had light in their dwellings.

24. And Pharaoh called unto Moses, and said, Go ye, serve Jehovah; only let your flocks and your herds be stayed: let your little ones also go with you.

Exodus 10