John 13:33-35

Little children, I am with you [only] a little longer. You will look for Me and, as I told the Jews, so I tell you now, ‘Where I am going, you are not able to come.’ [John 8:21] I am giving you a new commandment, that you love one another. Just as I have loved you, so you too are to love one another. By this everyone will know that you are My disciples, if you have love and unselfish concern for one another.”