And they shall say ... - Many false Christs, according to Josephus, appeared about that time, attempting to lead away the people. See the notes at Matthew 24:23-27.
Related Commentaries of Luke 17:23
Luke 17:23-24
23 And they shall say to you, See here; or, see there: go not after them, nor follow them.
24 For as the lightning, that lighteneth out of the one part under heaven, shineth unto the other part under heaven; so shall also the Son of man be in his day.