1 Corinthians 10:21

You cannot drink the Lord's cup and the cup of demons: you cannot be joint-partakers both in the table of the Lord and in the table of demons.

1 Corinthians 11:21-22

for it is his own supper of which each of you is in a hurry to partake, and one eats like a hungry man, while another has already drunk to excess.

1 Corinthians 11:27-32

Whoever, therefore, in an unworthy manner, eats the bread or drinks from the cup of the Lord sins 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 Lord's cup and the cup of demons: you cannot be joint-partakers both in the table of the Lord and in the table of demons.
1 Corinthians 11:21
for it is his own supper of which each of you is in a hurry to partake, and one eats like a hungry man, while another has already drunk to excess.