1 John 4:20
If a man says, “I love God,” and hates his brother, he is a liar; for he who doesn’t love his brother whom he has seen, how can he love God whom he has not seen?
World English Bible (Public Domain)
In context
Before · 1 John 4:18–19
18There is no fear in love; but perfect love casts out fear, because fear has punishment. He who fears is not made perfect in love. 19We love him, because he first loved us.
20If a man says, “I love God,” and hates his brother, he is a liar; for he who doesn’t love his brother whom he has seen, how can he love God whom he has not seen?
After · 1 John 4:21
21This commandment we have from him, that he who loves God should also love his brother.