1 Corinthians 11:17, 25-26

But in giving you this charge, I praise you not, that ye come together not for the better but for the worse.

In like manner also the cup, after supper, saying, This cup is the new covenant in my blood: this do, as often as ye drink it, in remembrance of me. For as often as ye eat this bread, and drink the cup, ye proclaim the Lord’s death till he come.