Exodus 7:25
Seven days after the LORD had struck the Nile River,
Exodus 8:9-10
Moses told Pharaoh, "You decide when I should plead for you, your servants, and your people to remove the frogs from you and your household. They'll remain only in the Nile River."
Exodus 10:23
No one could see anyone else, nor could anyone get up from his place for three days. But there was light for all the Israelis in their dwellings.
2 Samuel 24:13
So Gad went to David and asked him, "Shall seven years of famine come to your land, or three months of reversals while you flee from your enemies as they pursue you, or three days of pestilence in your land? Decide right now what I am to answer to the one who sent me."