1 John 1:6-10

6 If we say that we have fellowship with him and walk in the darkness, we lie, and don't tell the truth.  7 But if we walk in the light, as he is in the light, we have fellowship with one another, and the blood of Jesus Christ, his Son, cleanses us from all sin.  8 If we say that we have no sin, we deceive ourselves, and the truth is not in us.  9 If we confess our sins, he is faithful and righteous to forgive us the sins, and to cleanse us from all unrighteousness.  10 If we say that we haven't sinned, we make him a liar, and his word is not in us.