How do we know Jesus' prophecy about Judas is true?

The truth of Jesus' prophecy regarding Judas is affirmed by its precise fulfillment. Christ foretold that one of His disciples would betray Him, stating this not only for their awareness but to solidify their faith in His divinity—'that when it comes to pass, you may believe that I am He' (John 13:19). This act of betrayal, already indicated in John 6:70 where Jesus spoke of Judas as 'a devil', not only demonstrates His omniscience but highlights the reality of human depravity and the sovereignty of God in working through even the most tragic circumstances. Therefore, the betrayal serves both as a fulfillment of prophecy and a testament to the personal responsibility and wickedness within Judas’ heart.