Jn 13:3-7
Fully aware that the Father had put everything into his power and that he had come from God and was returning to God, he rose from supper and took off his outer garments. He took a towel and tied it around his waist. Then he poured water into a basin and began to wash the disciples' feet and dry them with the towel around his waist. He came to Simon Peter, who said to him, "Master, are you going to wash my feet?" Jesus answered and said to him, "What I am doing, you do not understand now, but you will understand later.".