Luke 8:30-33

30And Jesus asked him saying, What is thy name? And he said, Legion: for many demons had entered into him.

31And they besought him that he would not command them to go away into the bottomless pit.

32And there was there a herd of many swine feeding on the mountain, and they besought him that he would suffer them to enter into those; and he suffered them.

33And the demons, going out from the man, entered into the swine, and the herd rushed down the precipice into the lake, and were choked.