"Now before the feast of the Passover, when Jesus knew that his hour had come to depart out of this world to the Father, having loved his own who were in the world, he loved them to the end. And during supper, when the devil had already put into the heart of Judas Iscariot, Simon's son, to betray him, Jesus, knowing that the Father had given all things into his hands, and that he had come from God and was going to God, rose from supper, laid aside his garments, 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." John 13:1-5
Notice that Jesus washed the feet of ALL the disciples. Even Judas, who had thirty pieces of silver rattling in his pocket. Even Peter, who would soon deny even knowing Jesus. All of them: each who would run in fear when He needed them most.
He took servanthood to a whole new level. And they would never forget His example.