Why does Judas Iscariot serve as a warning for Christians?

Judas Iscariot epitomizes the grave dangers of hypocrisy and the potential for betrayal that exists even among those close to Christ. While he physically followed Jesus and participated in His ministry, Judas's heart was corrupted by greed and self-interest. His story serves as a stark reminder that one can be part of a faith community yet remain unrepentant and spiritually estranged from Christ. The anguish expressed by the other disciples asking ‘Is it I, Lord?’ in Mark 14:19 is an important reflection on self-examination. The warning is clear: believers must guard their hearts against the lure of sin and remain vigilant in their devotion to Christ to avoid the path that leads to spiritual ruin.