John Chrysostom
It seems to me that He washed His betrayer’s feet first. For after saying, “He began to wash the disciples’ feet,” the Evangelist then continues, “Then He came to Simon Peter, and Peter said to Him, ‘Lord, do You wash my feet?’” (v. 6).
That is: with those very hands by which You opened eyes, cleansed lepers, and raised the dead?
Truly this expression already says very much. Therefore Peter had no need to say anything more than, “Do You?” In this one word everything was expressed.
But someone may rightly ask: why did no one else prevent Him from washing the feet, but only Peter? This bears witness to no small love and reverence.
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What is the reason? It seems to me that Christ first washed the betrayer’s feet and then came to Peter, and that the others were instructed by Peter’s example.
That He truly washed someone else before Peter is clear from the words, “when He came to Peter.” The Evangelist, however, does not say this directly, but hints at it by the word “began.”
Although Peter was first, the betrayer, likely in his insolence, reclined even above the chief Apostle. His insolence is shown in other cases as well.
For example, he dips his hand in the dish with the Teacher. And though rebuked, he feels no pang of conscience.
Peter, after once being rebuked earlier, and rebuked for words he had spoken from love, became so humbled that even when in anguish and trembling, he turned to another so that he might ask.
But Judas, despite frequent rebukes, did not come to his senses.