Luke 8:30-33

Jesus then asked him, “What is your name?” He said, “Legion”; for many demons had entered him. They begged him not to order them to go back into the abyss. Now there on the hillside a large herd of swine was feeding; and the demons begged Jesus to let them enter these. So he gave them permission. Then 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.