1 Corinthians 10:21

You cannot drink the cup of the Lord and also the cup of demons; you cannot be partakers in the Lord's table and in the table of demons.

1 Corinthians 11:21-22

for each one of you begins to eat his own supper; one goes hungry, while another gets drunk.

1 Corinthians 11:27-32

So he that eats the bread or drinks the cup of the Lord unworthy must answer for a sin against the body and blood of the Lord.

Treasury of Scripture Knowledge

Summary

Ye offer polluted bread upon mine altar; and ye say, Wherein have we polluted thee? In that ye say, The table of the LORD is contemptible.

Bible References

The table

1 Corinthians 10:21
You cannot drink the cup of the Lord and also the cup of demons; you cannot be partakers in the Lord's table and in the table of demons.
1 Corinthians 11:21
for each one of you begins to eat his own supper; one goes hungry, while another gets drunk.