Exodus 10:23

they saw not one another, neither rose any from his place for three days. This was another sign of God's great anger and one of those that point forward to the last Judgment, a heavy, continuous darkness, which was not illumined by a single ray of light for three days. But all the children of Israel had light in their dwellings; the land of Goshen, where they dwelt, was not included in the plague.