Why Study the Bible?, page-200

A verse that you quote from Revelation 19 (highlight is mine)
20 And the wild beast was caught, and along with it the false prophet+ that performed in front of it the signs with which he misled those who received the mark of the wild beast+ and those who worship its image.+ While still alive, they both were hurled into the fiery lake that burns with sulfur.+

False prophets are recognized by their failed prophecies.