1st Corinthians 10:18

15 as to wise men I speak -- judge ye what I say:

16 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?

17 because one bread, one body, are we the many -- for we all of the one bread do partake.

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

19 what then do I say? that an idol is anything? or that a sacrifice offered to an idol is anything? --

20 [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.

21 Ye are not able the cup of the Lord to drink, and the cup of demons; ye are not able of the table of the Lord to partake, and of the table of demons;