1 John 3:10-12

Young's Literal Translation

¹⁰ In this manifest are the children of God, and the children of the devil; every one who is not doing righteousness, is not of God, and he who is not loving his brother,

¹¹ because this is the message that ye did hear from the beginning, that we may love one another,

¹² not as Cain -- of the evil one he was, and he did slay his brother, and wherefore did he slay him? because his works were evil, and those of his brother righteous.