'Have Fellowship With' in the Bible

that which we have seen and heard we proclaim also to you, so that you may have fellowship with us; and our fellowship is with the Father and with his Son Jesus Christ.

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

But if we walk in the light, as he is in the light, we have fellowship with one another, and the blood of Jesus his Son cleanses us from all sin.