1 John 3:10-12

Wycliffe Bible

¹⁰ In this thing the sons of God be known, and the sons of the fiend. Each man that is not just, is not of God, and he that loveth not his brother [and he that loveth not his brother, is not of God].

¹¹ For this is the telling, that ye heard at the beginning, that ye love each other;

¹² not as Cain, that was of the devil, and slew his brother. And for what thing slew he him? for his works were evil, and his brother's just.