John 13:10

10Jesus said to him: “He who is washed need only wash his feet, and then he will be entirely clean. And you are clean, but not all.”
13:10When Peter is washed at his head, his whole body is clean. Therefore, when a man become the Roman Pontiff, i.e. the successor of Peter, he cannot possibly fall into heresy. For he is necessarily prevented from this failing: his head has been washed by taking the office of Pope, so his whole self is clean from heresy and schism.(Conte)
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