Mark 13:5 contains Jesus' initial warning, 'See that no one leads you astray,' which this verse (v23) recalls with 'be on guard; I have told you all things beforehand.'

Mark 13:9 also commands 'be on your guard' but specifically about persecution, while v23 warns about false prophets — same exhortation, different focus.

Mark 13:33 repeats the 'be on guard' command regarding the timing of the end, echoing the vigilance required here against false prophets.

Luke 21:8 parallels this warning directly, telling disciples not to be misled by false claims about the end times.

John 14:29 gives the same purpose for foretelling: so that when events happen, disciples may believe.

John 16:1-4 similarly says Jesus spoke beforehand so that disciples would not stumble when persecution comes.

In John 16:4, Jesus says he told them beforehand so they would remember—same purpose as his foretelling here.

Matthew 7:15 also warns to beware of false prophets, echoing Jesus' command to be on guard against deception here.

2 Peter 3:17 echoes both the forewarning and the command to be on guard against being led astray by false teachers.

Luke 21:34 uses the same 'be on guard' phrase but warns against worldly distractions rather than deception.