Ye are my friends, if ye do whatsoever I command you—just because I command you. So the natural conclusion will be, "I am showing you the highest possible fruit of my friendship—I am laying down my life for you.
This is how I have loved you; therefore after this manner you are to love one another" (1 John 3:16; Ephesians 5:1, Ephesians 5:2). Our Lord then explains more and more to them how they can and do claim this glorious designation.