Matthew 24:11 - Albert Barnes' Notes on the Bible

And many false prophets - Many men pretending to be prophets or foretellers of future events. This refers not to the false “Messiahs” of which he had spoken Matthew 24:5, but to prophets who should appear during the siege of the city. Of them Josephus says: “The tyrannical zealots who ruled the city suborned “many false prophets” to declare that aid would be given to the people from heaven. This was done to prevent them from attempting to desert, and to inspire confidence in God.” - “Jewish Wars,” b. 6 chapter 5, section 2, 3.