The Great Commentary of Cornelius à Lapide
John 13:24
Simon Peter, therefore, gave him a sign, and said to him, Who is it of whom He speaks? Hence it is plain that Peter not only gave a sign to John by winking and nodding, as S. Augustine would have it, but also spoke to him quietly, as John here relates. Such is the opinion of Origen, Chrysostom, and Cyril. Peter asks this not as Prince of the Apostles (though Cyril takes this view), nor as though fearing, for himself lest he should be the traitor, as Chrysostom thinks, but out of his zeal, that he might avert so enormous a crime and prevent the betrayal of Christ, just as in the garden he wished to prevent His capture by cutting of the right ear of Malchus. Verses 25, 26. So when he had reclined upon the breast of Jesus, κ.τ.λ. John seems to have moved towards Peter, who was making signs to him, and so to have moved away a little from the bosom of Jesus in order to hear what Peter had to say; and having heard, he seems to have reoccupied his former position to ask of Jesus what Peter had suggested to him.
The bread I have dipped. Observe that Judas was present at the celebration of the Passover, and also of the Eucharist; and received the latter together with the other Apostles, as SS. Augustine, Chrysostom, Cyril, and others show. Indeed some have thought that this bread which He had dipped was the Eucharist, but erroneously; for Christ did not consecrate bread which He had dipped, but dry bread, and likewise pure wine and unmixed (with bread). Christ, after the Holy Communion, took from the table a morsel of the bread that remained, dipped it into some little dainty sauce that remained on the table, for it is not fitting that at a banquet dry bread should be given to a guest by the host, and gave it to Judas, that by this sign He might indicate him to John as the traitor. The other apostles did not hear the words of Christ to John about this way of pointing out the traitor, He having spoken quietly to John in his ear.
Moreover, Christ pointed him out by this sign with peculiar fitness, bread which we eat at table being a sign of peace and friendship, so that Christ showed by it, not only who the traitor was, but also the nature and mode of his treachery, for Judas was to betray Him by a similar sign of friendship, a kiss.
Mystically this dipping of the bread denoted the falseness and fraud that was in the soul of Judas, says St. Augustine. Again St. Cyril and Augustine say that Judas was pointed out by Christ by the morsel of bread that the words of Ps. xli. might be fulfilled "He that eateth bread with me hath lifted his heel against me." Indeed Chrysostom says that by this very act Christ here upbraided Judas with this, as if He had said, How is it, Judas, that thou, a companion of My table, art not ashamed to betray Me? Judas, then, having received the morsel from Christ, feeling by his own evil conscience, and by this sign, that he was a marked man, persisted shamelessly and obstinately in his intention of betraying Christ. For seeing himself found, out and disgraced, as it were beside himself and infuriated, he went forth at the devil's prompting to finish his crime, going to the chief priests to ask them for guards who, with him for their leader and guide, should seize Jesus.
Though Matthew puts these words and Christ's answer before the Eucharist, so that S. Augustine (De Consensu, Evang. bk. iii. ch. 1) thinks that they were spoken before it, yet from the words of Luke and John it is plain that they were spoken after the Eucharist. For it is altogether likely that Judas, when he heard Christ's answer, Thou hast said, straightway went out embarrassed and indignant. Immediately, then, after receiving the morsel he asked, Master, is it I? received the answer, Thou hast said, and then went out at once, covered with shame and indignation. Ver. 27. And after the morsel Satan entered into him, urging and impelling him to avenge this his disgrace, to betray to the Jews Christ who had betrayed his villainy. Satan, who had before entered into Judas for the plotting of the betrayal, as was said in verse 2, here again entered into him for its accomplishment; both because Judas, being already called by Christ and the apostles a traitor, dared remain among them no longer lest he should be ill-treated by them, and also because the hour proper for the betrayal, and appointed first by Judas, was near at hand that hour, namely, when he knew that Christ would, after His wont, go out to pray on Mount Olivet, where He could easily be seized. Wherefore there was no need for John to point out Judas to Peter when Christ pointed out the traitor to him, for Judas soon betrayed himself both by his question and by his departure.
So Satan entered into Judas to take complete possession of him, and that with certainty and with a strong hold, so that he brought him soon to the halter. Not that the morsel given him by Christ put the devil into him, for this was a sign of Christ's love by which He wanted to win the heart of Judas to love Him in return, but that Judas, ungrateful for this love of Christ, took it in bad part, thinking that Christ was giving him the morsel out of hatred and a desire to injure him and make his crime known to the apostles.
Wherefore, bidding farewell to the apostolate of Christ, he went away to the household and the bondage of Satan and of the Jews as a deserter and apostate. So S. Chrysostom, S. Augustine, and Cyril, who observes that a kindness hurts those who are ungrateful not of itself, but through their fault and ingratitude. S. Ambrose (De Cain et Abel, bk. 2 Chronicles 4) says "When Satan put himself into the heart of Judas, Christ went away from him, and in that moment when he received the former he lost the latter."
The devil entered into Judas for three reasons. First, for his ingratitude, says S. Augustine; for Christ having discharged all the offices of love towards him, and he not being moved even by these, was left to be fully possessed by the devil. Then again, because the devil knew from the words of the Lord and from outward signs that he was stubborn in his evil will, and given over by the Lord, says Chrysostom (Homily 71). Thirdly, because Judas himself understood that he was now found out, and, as it were, separated from the disciples and from their Master; so he became hardened in evil, and, as if in desperation, gave himself over entirely to the devil; and so it was that he went out, unable to bear the looks of his Lord and of the disciples, or, says Euthymius, following S. Chrysostom, fearing lest he should be torn to pieces by them. So Ribera.
Notice here in the case of Judas how a man who deserts Christ is palpably deserted by Christ, and when deserted is attacked by Satan possessed by him, and, when possessed, hurried into every crime, and then into the abyss. Just as Judas from an apostle became a devil, so Lucifer from the fairest of angels became the darkest of evil spirits, as the sourest vinegar is made from the sweetest wine, and the heretic Luther, for instance nay, the heresiarch, is made from the monk.
And Jesus said to him : What thou doest, do more quickly more quickly, that is quickly, as the Syriac translates it; the comparative is put for the positive. Christ is not precipitating the treason of Judas, but He permits it. He says as it were: Think not that thy doings are hidden from Me; I know that thou art meditating treason. He did not tell him to commit the crime, says S. Augustine, but He foretold it, not so much in wrathful desire for the destruction of the villain, as in haste for the safety of the faithful. He permitted it, saying, as it were: Do what thou hast begun, finish what thou didst intend; in a thousand ways could I hinder thee, but I will not; rather do I leave thee to thy free will. Do what thou hast planned in thy heart.
Thirdly, S. Chrysostom says they are words of reproach. I know that thou art working great evil against Me, from whom thou hast received so many gifts; are these the injuries thou repayest Me for so many kindnesses? But do what thou hast to do. For even though I have made known thy crime, yet have I not done so as fearing it, nor would I wish to hinder it; for if I wished I could do so; but in order to cast before thine eyes thy malice and thy shamelessness, and to reprove thee.
Fourthly, they are the words of a lofty mind that despises all the machinations of Judas. St. Leo (Serm. 1, On the Passion) says, "It is the voice of one who commands not but permits, of one not fearing but prepared, who, holding all time in His power, showed that He allowed no delay to the traitor, and that He so followed out the will of the Father for the redemption of the world, as neither to prompt nor fear the crime that was being matured."
Fifthly, they are the words of one excluding Judas, as incorrigible, from His family and the fellowship of the apostles. Since thou wilt sever thyself from us, I exclude thee from My table, from My house, My apostolate, and My companionship; get thee gone, then, to thine own Jews and to Satan, to whom thou hast sold thyself. So S. Ambrose (De Cain et Abel, bk. 2 Chronicles 4). Cyril (bk. ix. ch. 17), following Origen, interprets in a novel fashion, taking these things as said by Christ not to Judas but to Satan, who was entering into Judas. He says that, "Just as if a mighty man against whom some one advances with hostile intent, trusting in his own might, doubts not but that his adversary shall fall, and, with loud and threatening noise, speaks: What thou doest do quickly, that thou mayest know the strength of my right hand.