And seven days were fulfilled, after that the LORD had smitten the river.
And Moses said unto Pharaoh, Glory over me: when shall I intreat for thee, and for thy servants, and for thy people, to destroy the frogs from thee and thy houses, that they may remain in the river only?
And he said, To morrow. And he said, Be it according to thy word: that thou mayest know that there is none like unto the LORD our God.
They saw not one another, neither rose any from his place for three days: but all the children 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 thine enemies, while they pursue thee? or that there be three days' pestilence in thy land? now advise, and see what answer I shall return to him that sent me.