Exodus 8:2
And if you refuse to let them go, behold, I am going to strike all your borders with frogs.
Exodus 7:14
And Jehovah said to Moses, Pharaoh's heart is hardened. He refuses to let the people go.
Exodus 9:2
For if you refuse to let them go, and will hold them still,
Psalm 78:45
He sent different kinds of flies among them, which devoured them; and frogs, which destroyed them.
Psalm 105:30
Their land swarmed with frogs in the rooms of their kings.
Revelation 16:13-14
And I saw three unclean spirits like frogs come out of the mouth of the dragon, and out of the mouth of the beast, and out of the mouth of the false prophet.