1 John 3:10-12

Complete Jewish Bible

¹⁰ Here is how one can distinguish clearly between God’s children and those of the Adversary: everyone who does not continue doing what is right is not from God.

Likewise, anyone who fails to keep loving his brother is not from God. ¹¹ For this is the message which you have heard from the beginning: that we should love each other ¹² and not be like Kayin, who was from the Evil One and murdered his own brother. Why did he murder him? Because his own actions were evil, and his brother’s were righteous.