John 13:31–35 contains one of the most powerful commands given to Christians: that love for others is the defining sign of faith for ''all people,'' marking the life of a true believer. Jesus frames this as a new commandment, using His own example as the standard. In giving this charge, Jesus once again predicts His impending death and departure from earth.
https://www.bibleref.com/John/13/John-13-31.html
