1 John 4:20-21

Amplified Bible

²⁰ If anyone says, “I love God,” and hates (works against) his [Christian] brother he is a liar; for the one who does not love his brother whom he has seen, cannot love God whom he has not seen. ²¹ And this commandment we have from Him, that the one who loves God should also [unselfishly] love his brother and seek the best for him.