What does John 13:22 mean?

The name "Judas" has become synonymous with "traitor" in western culture. It's easy to forget that when Jesus ate this last supper with His inner circle, none of the disciples knew Judas was plotting to betray Jesus (Matthew 26:14–16). Jesus hinted at an impending act of treachery earlier (John 13:18), but has now said so in plain terms (John 13:21).

Confusion and suspicion would have been natural reactions when hearing these words. Another emotion felt by these men is personal fear—the worry in each man's heart that Jesus is speaking about him, in particular. John glosses over details that other gospel writers include. Matthew notes that the disciples mournfully ask Jesus, "is it me?" in turn (Matthew 26:22). What's most likely on their minds is the idea of leaving Jesus, rejecting Him, or becoming one of His critics. It's unlikely any of these men imagined that "betrayal" here means one of the inner circle turning Jesus over to people seeking His death.

This moment also sets a dark tone over Peter's foolhardy promise, and Jesus' response. Later, Peter will claim he's ready to follow Jesus anywhere, even into death. Jesus will respond that Peter will deny even knowing Him three times (John 13:37–38). That statement might well have made the others suspect Peter as the betrayer.