Mt 24:5,23,24  For many shall come in my name, saying, I am Christ; and shall deceive many. 23  Then if any man shall say unto you, Lo, here is Christ, or there; believe it not. 24  For there shall arise false Christs, and false prophets, and shall shew great signs and wonders; insomuch that, if it were possible, they shall deceive the very elect. 

Mk 13:21,22  And then if any man shall say to you, Lo, here is Christ; or, lo, he is there; believe him not:  22  For false Christs and false prophets shall rise, and shall shew signs and wonders, to seduce, if it were possible, even the elect. 

Lk 21:8  And he said, Take heed that ye be not deceived: for many shall come in my name, saying, I am Christ; and the time draweth near: go ye not therefore after them.