1 John 3:14-16

14We know that we have passed from death to life, because we love each other. Anyone who does not love remains in death.

15Anyone who hates a brother or sister is a murderer, and you know that no murderer has eternal life residing in him. 16This is how we know what love is: Jesus Christ laid down his life for us. And we ought to lay down our lives for our brothers and sisters.