3 Bible Verses about Demonic Influence

for these are the spirits of demons, working miracles, which go forth to the kings of the whole world, to bring them together to the battle of that great day of God Almighty.

Not being of the wicked one, as Cain was, who slew his brother. And on account of what, did he slay him? Because his own works were wicked, and his brother's righteous.

And I saw, and out of the mouth of the dragon, and out of the mouth of the beast, and out of the mouth of the false prophet there came forth three unclean spirits, like frogs: