BLB(i)
10 Through this, the children of God and the children of the devil are manifest: anyone not practicing righteousness is not of God, and also the one not loving his brother.
11 For this is the message that you have heard from the beginning, that we should love one another,
12 not as Cain, who was of the evil one and slew his brother. And why did he slay him? Because his works were evil, but those of his brother, righteous.
13 And do not be surprised, brothers, if the world hates you.
14 We know that we have passed from death to life, because we love our brothers. The one not loving abides in death.
15 Everyone hating his brother is a murderer; and you know that any murderer does not have eternal life abiding in him.
16 By this we have known love, because He laid down His life for us; and we ought to lay down our lives for our brothers.
17 Now whoever might have the world’s goods, and might see his brother having need, and might close up his heart from him, how does the love of God abide in him?
18 Little children, we should love not in word, nor in tongue, but in action and in truth.