Matthew 24:5, 11, 23-24

For many will come in My name [misusing it, and appropriating the strength of the name which belongs to Me], saying, ‘I am the Christ (the Messiah, the Anointed),’ and they will mislead many.

Many false prophets will appear and mislead many.

Then if anyone says to you [during the great tribulation], ‘Look! Here is the Christ,’ or ‘There He is,’ do not believe it. For false Christs and false prophets will appear and they will provide great signs and wonders, so as to deceive, if possible, even the elect (God’s chosen ones).