Matthew 24:23-25 (New International Version)

23At that time if anyone says to you, ‘Look, here is the Christ!’ or, ‘There he is!’ do not believe it.
24For false Christs and false prophets will appear and perform great signs and miracles to deceive even the elect–if that were possible.
25See, I have told you ahead of time.

Mark 13:21-23 (New International Version)

21At that time if anyone says to you, ‘Look, here is the Christ!’ or, ‘Look, there he is!’ do not believe it.
22For false Christs and false prophets will appear and perform signs and miracles to deceive the elect–if that were possible.
23So be on your guard; I have told you everything ahead of time.

2 Peter 2:1-3 (New International Version)

False Teachers and Their Destruction
1But there were also false prophets among the people, just as there will be false teachers among you. They will secretly introduce destructive heresies, even denying the sovereign Lord who bought them–bringing swift destruction on themselves.
2Many will follow their shameful ways and will bring the way of truth into disrepute.
3In their greed these teachers will exploit you with stories they have made up. Their condemnation has long been hanging over them, and their destruction has not been sleeping.