"Jesus, knowing that the Father had given all things into his hands, and that he had come from God and was going to God, got up from the table, took off his outer robe, and tied a towel around himself. Then he poured water into a basin and began to wash the disciples' feet and to wipe them with the towel that was tied around him. He came to Simon Peter, who said to him, 'Lord, are you going to wash my feet?'"
Foot-washing was a slave's job, if that. More often, people were given water or ointment by a host to wash their own feet after a dusty day of walking. Yet here, Jesus, the teacher, takes on the duties of the slave and gets up from his position at the table to wash the disciples' feet.