Luke 8:29-33

For He had commanded the unclean spirit to come out of the man. For it had seized him many times; and he was bound with chains and shackles and kept under guard, and yet he would break his bonds and be driven by the demon into the desert. 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.