Beloved, I am writing you no new commandment, but an old commandment that you have had from the beginning; the old commandment is the word that you have heard.
Yet I am writing you a new commandment that is true in him and in you, because the darkness is passing away and the true light is already shining.
References for 1 John 2:8
Whoever says, "I am in the light," while hating a brother or sister, is still in the darkness.
References for 1 John 2:9
Whoever loves a brother or sister lives in the light, and in such a person there is no cause for stumbling.
References for 1 John 2:10
But whoever hates another believer is in the darkness, walks in the darkness, and does not know the way to go, because the darkness has brought on blindness.
References for 1 John 2:11