1 John 2:5-11 New Revised Standard Version (NRSV)
5 but whoever obeys his word, truly in this person the love of God has reached perfection. By this we may be sure that we are in him: 6 whoever says, “I abide in him,” ought to walk just as he walked.
A New Commandment
7 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. 8 Yet I am writing you a new commandment that is true in him and in you, because[a] the darkness is passing away and the true light is already shining. 9 Whoever says, “I am in the light,” while hating a brother or sister,[b] is still in the darkness. 10 Whoever loves a brother or sister[c] lives in the light, and in such a person[d] there is no cause for stumbling. 11 But whoever hates another believer[e] is in the darkness, walks in the darkness, and does not know the way to go, because the darkness has brought on blindness.