Question: Where are demons mentioned in the Bible?
Gadarene swine the pigs into which Jesus cast the demons that had possessed a madman (see legion), and which as a result ran down a steep cliff into the sea and were killed; from this, Gadarene means involving or engaged in a headlong or potentially disastrous rush to do something.
The exorcism of the Gerasene demoniac, frequently known as the Miracle of the (Gadarene) Swine and the exorcism of Legion, is one of the miracles performed by Jesus according to the New Testament. The story shows Jesus exorcising a demon or demons out of a man and into a herd of swine, causing the swine to run down a hill into a lake and drown themselves.
Demons are the servants of Satan; and thought to be from fallen angels!