1 John 2:9

2:9 The one who says he is in the light but still hates his fellow Christian is still in the darkness.

1 John 3:12

3:12 not like Cain who was of the evil one and brutally murdered his brother. And why did he murder him? Because his deeds were evil, but his brother’s were righteous.

1 John 4:21

4:21 And the commandment we have from him is this: that the one who loves God should love his fellow Christian too.