Psalm 108:9

Revised Standard Version (RSV-CI)

Moab is my washbasin; upon Edom I cast my shoe; over Philistia I shout in triumph.”

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If I then, your Lord and Teacher, have washed your feet, you also ought to wash one another's feet.

Peter said to him, “You shall never wash my feet.” Jesus answered him, “If I do not wash you, you have no part in me.”