1 Corinthians 10:3-4
10:3 and all ate the same spiritual food,
10:4 and all drank the same spiritual drink. For they were all drinking from the spiritual rock that followed them, and the rock was Christ.
1 Corinthians 10:21
10:21 You cannot drink the cup of the Lord and the cup of demons. You cannot take part in the table of the Lord and the table of demons.
1 Corinthians 11:26-28
11:26 For every time you eat this bread and drink the cup, you proclaim the Lord’s death until he comes.
11:27 For this reason, whoever eats the bread or drinks the cup of the Lord in an unworthy manner will be guilty of the body and blood of the Lord.
11:28 A person should examine himself first, 1 and in this way 2 let him eat the bread and drink of the cup.
1 tn The word “first” is not in the Greek text, but is implied. It has been supplied in the translation for clarity.
2 tn Grk “in this manner.”