'Have Fellowship With' in the Bible

No, but that which the Gentiles sacrifice, they sacrifice to demons, not to God; and I would not have you have fellowship with one another through the demons.

If, while we are living in darkness, we profess to have fellowship with Him, we speak falsely and are not adhering to the truth.

But if we live 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.