Exodus 7:25
And seven days were fulfilled, after that Jehovah had smitten the river.
Exodus 8:9-10
And Moses said unto Pharaoh, Have thou this glory over me: against what time shall I entreat for thee, and for thy servants, and for thy people, that the frogs be destroyed from thee and thy houses, and remain in the river only?
Exodus 10:23
they saw not one another, neither rose any one 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 thy foes while they pursue thee? or shall there be three days pestilence in thy land? now advise thee, and consider what answer I shall return to him that sent me.