“Jesus answered them.
That no one leads you astray.
Many will come
In my name.
‘I am the Christ Messiah.’
They will lead many astray.”
καὶ ἀποκριθεὶς ὁ Ἰησοῦς εἶπεν αὐτοῖς Βλέπετε μή τις ὑμᾶς πλανήσῃ.
πολλοὶ γὰρ ἐλεύσονται ἐπὶ τῷ ὀνόματί μου λέγοντες Ἐγώ εἰμι ὁ Χριστός, καὶ πολλοὺς πλανήσουσιν.
There is something similar in Mark, chapter 13:5-6, and in Luke, chapter 21:8, almost word for word. Jesus warned them against people who might lead them astray (καὶ ἀποκριθεὶς ὁ Ἰησοῦς εἶπεν αὐτοῖς Βλέπετε μή τις ὑμᾶς πλανήσῃ). Many people would come in his name (πολλοὶ γὰρ ἐλεύσονται ἐπὶ τῷ ὀνόματί μου) saying that they were the Messiah Christ (λέγοντες Ἐγώ εἰμι ὁ Χριστός) in order to deceive them and lead them astray (καὶ πολλοὺς πλανήσουσιν). 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 1st century CE. Other political Jewish leaders had messianic ambitions also, especially those who led the revolt against the Romans in the 2nd half of the 1st century. Jesus was warning against all of them.