1 John 4:8

4:8 The person who does not love does not know God, because God is love.

1 John 4:20-21

4:20 If anyone says “I love God” and yet hates his fellow Christian, he is a liar, because the one who does not love his fellow Christian whom he has seen cannot love God whom he has not seen. 4:21 And the commandment we have from him is this: that the one who loves God should love his fellow Christian too.