Exodus 8:2
And if thou refuse to let them go, behold, I will smite all thy borders with frogs.
Exodus 7:14
And Jehovah said to Moses, Pharaoh's heart is hardened: he refuseth to let the people go.
Exodus 9:2
For if thou refuse to let them go, and shalt retain them still,
Psalm 78:45
He sent dog-flies among them, which devoured them, and frogs, which destroyed them;
Psalm 105:30
Their land swarmed with frogs, in the chambers of their kings.
Revelation 16:13-14
And I saw out of the mouth of the dragon, and out of the mouth of the beast, and out of the mouth of the false prophet, three unclean spirits, as frogs;