15 "If your brother sins against you, go and tell him his fault, between you and him alone. If he listens to you, you have gained your brother. 16 But if he does not listen, take one or two others along with you, that every word may be confirmed by the evidence of two or three witnesses. 17 If he refuses to listen to them, tell it to the church; and if he refuses to listen even to the church, let him be to you as a Gentile and a tax collector. 18 Truly, I say to you, whatever you bind on earth shall be bound in heaven, and whatever you loose on earth shall be loosed in heaven. 19 Again I say to you, if two of you agree on earth about anything they ask, it will be done for them by my Father in heaven. 20 For where two or three are gathered in my name, there am I in the midst of them."
Reading 3, 1Jn 2:7-11 : Those who hate the brother dwells in darkness.
7 Beloved, I am writing you no new commandment, but an old commandment which you had from the beginning; the old commandment is the word which you have heard. 8 Yet I am writing you a new commandment, which is true in him and in you, because the darkness is passing away and the true light is already shining. 9 He who says he is in the light and hates his brother is in the darkness still. 10 He who loves his brother abides in the light, and in it there is no cause for stumbling. 11 But he who hates his brother is in the darkness and walks in the darkness, and does not know where he is going, because the darkness has blinded his eyes.