Exodus 7:25
And seven days were fulfilled after the LORD had smitten the river.
Exodus 8:9-10
And Moses said unto Pharaoh, Tell me: when shall I intreat for thee and for thy slaves and for thy people, to destroy the frogs from thee and thy houses, that they may remain only in the river?
Exodus 10:23
They did not see one another, neither did any rise from his place for three days; but all the sons of Israel had light in their dwellings.
2 Samuel 24:13
So Gad came to David and told him and said unto him, Shall seven years of famine come unto thee in thy land? Or wilt thou flee three months before thy enemies while they pursue thee? Or shall there be three days' pestilence in thy land? Now advise, and see what answer I shall return to him that sent me.