NET
21 Then if anyone says to you, ‘Look, here is the Christ!’ or ‘Look, there he is!’ do not believe him.
Darby
21 And then if any one say to you, Lo, here [is] the Christ, or Lo, there, believe [it] not.
KJV
21 “And then if any man shall say to you, Lo, here” [is] “Christ; or, lo,” [he is] “there; believe” [him] “not:”