Why did Jesus was His friends' feet?

Jesus showed them how to love and help each other.

Jesus is King over everything, but He got down and washed His friends' dirty feet, even Judas' feet. Jesus loved and helped His friends and taught them to love and help each other. Jesus loves us and helped us by doing for us what we could never do: die on the cross for our sins. He is our King, and He died in our place.