1 Corinthians 11:25-27

11:25 In the same way, he also took the cup after supper, saying, “This cup is the new covenant in my blood. Do this, every time you drink it, in remembrance of me.” 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.