The Antichrist
"The term comes from 1 John 4:1-3: (NIV) Dear friends, do not believe every spirit, but test the spirits to see whether they are from GodÉThis is the spirit of the antichrist, which you have heard is coming and even now is already in the world.
"The person is described here and also in 2 Thessalonians 2, Daniel 7, and Revelation 13.