1 Corinthians 11:23-31

I have already told you what the Lord Jesus did on the night he was betrayed. And it came from the Lord himself. He took some bread in his hands. Then after he had given thanks, he broke it and said, “This is my body, which is given for you. Eat this and remember me.” After the meal, Jesus took a cup of wine in his hands and said, “This is my blood, and with it God makes his new agreement with you. Drink this and remember me.” The Lord meant that when you eat this bread and drink from this cup, you tell about his death until he comes. But if you eat the bread and drink the wine in a way that isn't worthy of the Lord, you sin against his body and blood. This is why you must examine the way you eat and drink. If you fail to understand that you are the body of the Lord, you will condemn yourselves by the way you eat and drink. This is why many of you are sick and weak and why a lot of others have died. If we carefully judge ourselves, we won't be punished.