'Communion' in the Bible

The cup of blessing which we bless, is it not a communion of the blood of Christ? The bread which we break, is it not a communion of the body of Christ?

Behold Israel after the flesh: have not they that eat the sacrifices communion with the altar?

But I say , that the things which the Gentiles sacrifice, they sacrifice to demons, and not to God: and I would not that ye should have communion with demons.

Be not unequally yoked with unbelievers: for what fellowship have righteousness and iniquity? or what communion hath light with darkness?

The grace of the Lord Jesus Christ, and the love of God, and the communion of the Holy Spirit, be with you all.