'Have Fellowship With' in the Bible

what we have seen and heard we also declare to you, so that ye also may have fellowship with us. Even also our fellowship with the Father, and with his Son Jesus Christ.

If we say that we have fellowship with him and walk in the darkness, we lie, and do not the truth.

But if we walk in the light, as he is in the light, we have fellowship with each other, and the blood of Jesus Christ his Son cleanses us from every sin.