Exodus 7:25
And seven days passed after Yahweh struck the Nile.
Exodus 8:9-10
And Moses said to Pharaoh, "{I leave to you the honor} over me. When shall I pray for you and for your servants and for your people to cut off the frogs from you and from your houses? They will be left only in the Nile."
Exodus 10:23
No one could see his brother, and {because of it no one could move from where they were} [for] three days, but there was light for the {Israelites} in their dwellings.
2 Samuel 24:13
Then Gad came to David, and he told him and said to him, "Shall seven years of famine in the land come to you? Or three months of your fleeing from your enemies while he [is] pursuing you? Or should there be three days of pestilence in your land? Now consider and decide what I must return to the one who sent me a word."