Exodus 8:2
If thou wilt not let them go, behold: I will smite all thy land with frogs.
Exodus 7:14
Then said the LORD unto Moses, "Pharaoh's heart is hardened, and he refuseth to let the people go.
Exodus 9:2
If thou wilt not let them go but wilt hold them still:
Psalm 78:45
How he sent lice among them, to eat them up, and frogs to destroy them;
Psalm 105:30
Their land brought forth frogs; yea, even in their king's chambers.
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.