Mark 5:9

And He asked him, What is your name? And he answered, saying, My name is Legion, for we are many.

Matthew 26:53

Do you think that I cannot now pray to My Father, and He shall presently give Me more than twelve legions of angels?

Luke 8:30

And Jesus asked him, saying, What is your name? And he said, Legion; because many demons had entered into him.

Then he goes and takes with him seven other spirits more evil than himself, and they enter in and live there. And the last state of that man is worse than the first. Even so it also shall be to this evil generation.

Mark 5:15

And they came to Jesus and saw him who had been demon-possessed, and had the legion, sitting and clothed and right-minded, the one who had the legion. And they were afraid.