1 John 3:14

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

Read 1 John 3:14 Using Other Translations

We know that we have passed from death unto life, because we love the brethren. He that loveth not his brother abideth in death.
We know that we have passed out of death into life, because we love the brothers. Whoever does not love abides in death.
If we love our brothers and sisters who are believers, it proves that we have passed from death to life. But a person who has no love is still dead.