'Fellowship' in the Bible

faithful is God, through whom ye were called to the fellowship of His Son Jesus Christ our Lord.

The cup of the blessing that we bless -- is it not the fellowship of the blood of the Christ? the bread that we break -- is it not the fellowship of the body of the Christ?

See Israel according to the flesh! are not those eating the sacrifices in the fellowship of the altar?

no, but that the things that the nations sacrifice -- they sacrifice to demons and not to God; and I do not wish you to come into the fellowship of the demons.