1 John 4:20

20 Anyone who says he loves God but in fact hates his brother or sister is a liar. He doesn't love his brother or sister, whom he has seen. So he can't love God, whom he has not seen.

1 John 4:20 Meaning and Commentary

1 John 4:20

If a man say I love God, and hateth his brother
Than which profession nothing can be more contradictory, not black and white, or hot and cold in the same degree:

he is a liar;
it is not truth he speaks, it is a contradiction, and a thing impossible:

for he that loveth not his brother whom he hath seen;
his person, which might have drawn out his affection to him; and something valuable and worthy in him, which might have commanded respect; or his wants and distresses, which should have moved his pity and compassion:

how can he love God whom he hath not seen?
it cannot be thought he should; the thing is not reasonable to suppose; it is not possible he should; (See Gill on 1 John 4:12).

1 John 4:20 In-Context

18 There is no fear in love. Instead, perfect love drives fear away. Fear has to do with being punished. The one who fears does not have perfect love.
19 We love because he loved us first.
20 Anyone who says he loves God but in fact hates his brother or sister is a liar. He doesn't love his brother or sister, whom he has seen. So he can't love God, whom he has not seen.
21 Here is the command God has given us. Anyone who loves God must also love his brothers and sisters.