I Corinthians 11:25-26, 33

In the same manner He also took the cup after supper, saying, “This cup is the new covenant in My blood. This do, as often as you drink it, in remembrance of Me.” For as often as you eat this bread and drink this cup, you proclaim the Lord’s death till He comes.

Therefore, my brethren, when you come together to eat, wait for one another.