'Have Fellowship With' in the Bible

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

If we say that we have fellowship with him, and walk in darkness, we lie, and obey not 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 Christ the Son cleanses us from all sin.