Mark 13:5

5 And Jesus began to say to them, “See to it that no one deceives you.

Mark 13:6

6 Many will come in My name, saying, ‘^aI am He!’ and will mislead many.

Mark 13:21-23

21 And then if anyone says to you, ‘Behold, here is the ¹Christ’; or, ‘Behold, He is there’; do not believe him; 22 for false christs and ^afalse prophets will arise, and will show ¹^bsigns and ^bwonders, in order to lead astray, if possible, the elect. 23 But as for you, see! I have told you everything in advance.