Mark 9:26
The spirit shrieked and caused violent convulsions [in the boy], then came out of him. The boy appeared to be dead, so that most of the people were saying, "He is dead."
Mark 9:20
Then they [i.e., some people from the crowd] brought the sick boy to Jesus, and when the spirit saw Him, it immediately caused the boy to have convulsions and to fall to the ground and roll around, foaming at the mouth.
Mark 1:26
And the evil spirit caused the man to have a convulsion, then shouted with a loud voice and came out of him.
Mark 9:18
Wherever it seizes him, it throws him down and he foams at the mouth, grinds his teeth and stiffens out. I spoke to your disciples, asking them to drive it out, but they were not able to."
Revelation 12:12
So, rejoice, you heavens and you who live there. It is too bad for the earth and for the ocean, because the devil has gone down to you with great rage, knowing that he has [only] a short time left."