1 John 3:14

We know that we have passed from death to life, because we love the brethren. He who does not love his brother abides in death.

Surrounding context

3:13 Do not marvel, my brethren, if the world hates you.

3:14 We know that we have passed from death to life, because we love the brethren. He who does not love his brother abides in death.

3:15 Whoever hates his brother is a murderer, and you know that no murderer has eternal life abiding in him.