JMNT(i)
5 So Jesus, giving a decided response, began to be saying to them, "Be continuously observing, and see to it [that] no one can lead you folks astray (or: should at some point deceive you people).
6 "Many folks will continue coming [depending or basing their authority] upon My Name, repeatedly saying 'I myself am' (or: saying that, 'I, in contradistinction to others, am he [or: the one] ') – and they will successively be leading many folks astray (or: deceiving many).