Psalm 108:9

New International Version

Moab is my washbasin, on Edom I toss my sandal; over Philistia I shout in triumph.”

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Now that I, your Lord and Teacher, have washed your feet, you also should wash one another’s feet.

“No,” said Peter, “you shall never wash my feet.” Jesus answered, “Unless I wash you, you have no part with me.”