John 13:21 - 38

Jesus very plainly and clearly states that one of His followers will betray Him.  Immediately, the followers begin a process of self-inspection, dreading that they might give the Master into the hands of others.  The one who would betray Him was very carefully hidden ... from everyone but Jesus.  The betrayer having left their gathering, the other followers begin to discuss their plans to never abandon Jesus.  Jesus continues to stress to them that where He is going they can not immediately follow, much to their concern and protestation.