By this we have come to know love: that he laid down his life on our behalf. And we are obligated to lay down our lives for the brothers (adelphōn | ἀδελφῶν | gen pl masc).

Everyone who hates his brother (adelphon | ἀδελφόν | acc sg masc) is a murderer, and you know that no murderer has eternal life abiding in him.

We know that we have crossed over from death to life, because we love the brothers (adelphous | ἀδελφούς | acc pl masc). Whoever does not love remains in the realm of death.

So do not be surprised, brothers (adelphoi | ἀδελφοί | voc pl masc), if the world hates you.

We are not to be like Cain who was of the evil one and murdered his brother (adelphon | ἀδελφόν | acc sg masc). And why did he murder him? Because his own deeds were evil and those of his brother (adelphou | ἀδελφοῦ | gen sg masc) were righteous.

By this the children of God and the children of the devil are revealed: whoever does not practice righteousness is not of God, nor is the one who does not love his brother (adelphon | ἀδελφόν | acc sg masc).

But the one who hates his brother (adelphon | ἀδελφόν | acc sg masc) is in the darkness; he walks in the darkness and does not know where he is going, because the darkness has blinded his eyes.

The one who loves his brother (adelphon | ἀδελφόν | acc sg masc) is living in the light and in him there is no cause for stumbling.

The one who claims to be in the light but goes on hating his brother (adelphon | ἀδελφόν | acc sg masc) is still in the darkness.

And consider the patience of our Lord as salvation, just as also our dear brother (adelphos | ἀδελφός | nom sg masc) Paul wrote to you according to the wisdom given to him,