“By this everyone will know that you are my disciples, if you love one another.” That’s the mark. That’s how we can be identified as Jesus followers: by loving each other. This was the command Jesus gave to those who follow his way, and as disciples they understood that living life in imitation of their rabbi was what being a disciple was all about.
Jesus, later tells them what this love looks like when he speaks about laying down one’s life for their friends. Of course, in the immediate context, Jesus was about to lay down his life for everyone, not just his friends. But when we consider practicing love in the way of Jesus - what does it look like for us to lay down our lives for one another?