'Communion' in the Bible

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

See Israel according to flesh: are not they who eat the sacrifices in communion with the altar?

But that what the nations sacrifice they sacrifice to demons, and not to God. Now I do not wish you to be in communion with demons.

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