John 13:6

Revised Standard Version (RSV-CI)

He came to Simon Peter; and Peter said to him, “Lord, do you wash my feet?”

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But when Simon Peter saw it, he fell down at Jesus' knees, saying, “Depart from me, for I am a sinful man, O Lord.”

even he who comes after me, the thong of whose sandal I am not worthy to untie.”

Then he poured water into a basin, and began to wash the disciples' feet, and to wipe them with the towel with which he was girded.

Jesus answered him, “What I am doing you do not know now, but afterward you will understand.”