Luke 8:30

Then Jesus asked him, "What is your name?" And he answered, " [My name is] 'Legion'" [Note: This word means a number consisting of between 5,000 and 6,000], for many evil spirits had entered the man.

Matthew 26:53

Or, do you think that I cannot appeal to my Father and He will immediately send me more than twelve legions of angels [i.e., Jesus could have called about 72,000 angels to minister to Him. See Matt. 4:11]?

Matthew 8:29

Suddenly they shouted out, "What do you want with us, you Son of God? Have you come here to torture us before it is time to?" [i.e., before our punishment is due. See II Pet. 2:4; Jude 6].

Mark 5:9

Then He asked [the evil spirit], "What is your name?" And he answered Him, "My name is 'Legion,' [Note: This word means a number consisting of between 5,000 and 6,000], for there are many of us [i.e., evil spirits]."

Mark 16:9

Now when Jesus arose from the dead early on the first day of the week [i.e., Sunday morning], He appeared first to Mary from Magdala, from whom He had driven out seven evil spirits.

Luke 8:2

and certain women who had been healed from [domination by] evil spirits and diseases. [These women were] Mary, called Magdalene, from whom seven evil spirits had been driven out,

Treasury of Scripture Knowledge

Summary

And Jesus asked him, saying, What is thy name? And he said, Legion: because many devils were entered into him.

General references

Bible References

Legion

Matthew 26:53
Or, do you think that I cannot appeal to my Father and He will immediately send me more than twelve legions of angels [i.e., Jesus could have called about 72,000 angels to minister to Him. See Matt. 4:11]?
Mark 5:9
Then He asked [the evil spirit], "What is your name?" And he answered Him, "My name is 'Legion,' [Note: This word means a number consisting of between 5,000 and 6,000], for there are many of us [i.e., evil spirits]."

Many

Luke 8:2
and certain women who had been healed from [domination by] evil spirits and diseases. [These women were] Mary, called Magdalene, from whom seven evil spirits had been driven out,
Matthew 8:29
Suddenly they shouted out, "What do you want with us, you Son of God? Have you come here to torture us before it is time to?" [i.e., before our punishment is due. See II Pet. 2:4; Jude 6].
Mark 16:9
Now when Jesus arose from the dead early on the first day of the week [i.e., Sunday morning], He appeared first to Mary from Magdala, from whom He had driven out seven evil spirits.

General references

Matthew 8:31
So, the evil spirits [in one of the men. See Mark 5:1ff] begged Jesus, saying, "If you are going to drive us out [of this man], send us away into that herd of [wild] hogs."
Acts 19:15
[On one occasion] the evil spirit replied, "I know Jesus and I know Paul, but who are you?"