1 Corinthians 11:25-27

In the same way, after supper He took the cup, saying, “This cup is the new covenant [ratified and established]in My blood; do this, as often as you drink it, in [affectionate]remembrance of Me.” For every time you eat this bread and drink this cup, you are [symbolically] proclaiming [the fact of] the Lord’s death until He comes [again]. So then whoever eats the bread or drinks the cup of the Lord in a way that is unworthy [of Him] will be guilty of [profaning and sinning against] the body and blood of the Lord.