Mark 13:21
And then if any man shall say to you, Lo, here is Christ; or, lo, he is there; believe him not:
Cross-reference
Deuteronomy 13:1-3 warns against false prophets who lead astray, similar to the warning here against false christs deceiving the elect.
Matthew 24:5 is a direct parallel, warning that many will claim to be the Christ and deceive others.
Matthew 24:23-25 expands on this warning, adding false prophets and signs that could deceive even the elect.
Luke 17:24 contrasts false claims by describing the true coming as lightning, sudden and visible for all.
Luke 21:8 parallels this warning, cautioning against being led astray by those saying 'I am he' or 'the time is at hand.'
1 John 2:18 directly links many antichrists to the last hour, reinforcing the warning about false christs as an end-times sign.
Luke 17:23 gives a similar warning about false claims of Christ's location, though in a different eschatological setting.
Luke 17:21 uses the same 'look here/there' language but says the kingdom is already present, contrasting the false alerts warned against here.
John 5:43 warns that people will accept a false messiah coming in his own name, echoing the false christs warned about here.
1 John 4:1 commands believers to test spirits due to many false prophets, supporting the call here not to believe false claims.