Exodus 7:25
And seven days were fulfilled after that the LORD had smitten the river.
Exodus 8:9-10
And Moses said to Pharaoh, Glory over me: when shall I entreat 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?
Exodus 10:23
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 to him, Shall seven years of famine come upon thee in thy land? or wilt thou flee three months before thy enemies, while they pursue thee? or that there be three days' pestilence in thy land? Now consider, and see what answer I shall return to him that sent me.