“If anyone says to you.

‘Look!

Here is the Messiah Christ!’

Or

‘There he is!’

Do not believe it.

False Christs

And false prophets

Will appear!

They will produce

Great signs

And wonders,

To lead astray,

If possible,

Even the elect.”

τότε ἐάν τις ὑμῖν εἴπῃ Ἰδοὺ ὧδε ὁ Χριστός, ἤ Ὧδε, μὴ πιστεύσητε·

ἐγερθήσονται γὰρ ψευδόχριστοι καὶ ψευδοπροφῆται, καὶ δώσουσιν σημεῖα μεγάλα καὶ τέρατα ὥστε πλανῆσαι, εἰ δυνατὸν, καὶ τοὺς ἐκλεκτούς

This is exactly the same, almost word for word, in Mark, chapter 13:21-22, with a hint of this in Luke, chapter 17:22-23.  Matthew also spoke about the false Messiahs earlier in this chapter 24:5.  Jesus warned his disciples that if anyone said to them to look because the Messiah Christ was there (τότε ἐάν τις ὑμῖν εἴπῃ Ἰδοὺ ὧδε ὁ Χριστός, ἤ Ὧδε), they were not to believe it (μὴ πιστεύσητε).  Both false or pseudo Christs and false and pseudo prophets would appear (ἐγερθήσονται γὰρ ψευδόχριστοι καὶ ψευδοπροφῆται).  They would produce great signs and wonders (καὶ δώσουσιν σημεῖα μεγάλα καὶ τέρατα), in order to lead astray even the elect or the chosen ones (ὥστε πλανῆσαι, εἰ δυνατὸν, καὶ τοὺς ἐκλεκτούς).  Both Mark, chapter 13:5-6, and Luke, chapter 21:8, also warned them against people who might lead them astray.  Many people would come saying that they were the Messiah Christ in order to deceive them.  Apparently, there were many deceptive Jewish messianic leaders who were saying that they were the Christ Messiah.  John the Baptist was an example of a messianic leader in the 1^st century CE.  Other political Jewish leaders had messianic ambitions also, especially those who led the revolt against the Romans in the 2^nd half of the 1^st century.  Jesus was warning against all of them.