Luke 8:30-33

And Jesus asked him, “What is your name?” And he said, “Legion”; for many demons had entered him. They were imploring Him not to command them to go away into the abyss. Now there was a herd of many swine feeding there on the mountain; and the demons implored Him to permit them to enter the swine. And He gave them permission. And the demons came out of the man and entered the swine; and the herd rushed down the steep bank into the lake and was drowned.