Berean Standard Bible
1 John 4:20
“If anyone says, “I love God,” but hates his brother, he is a liar. For anyone who does not love his brother, whom he has seen, cannot love God, whom he has not seen.”

In context
19We love because He first loved us.
20If anyone says, “I love God,” but hates his brother, he is a liar. For anyone who does not love his brother, whom he has seen, cannot love God, whom he has not seen.
21And we have this commandment from Him: Whoever loves God must love his brother as well.
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Berean Standard Bible · A modern, readable English translation. Public domain (CC0).