Analyticae Quaestiones & Responsiones de pane vitae

The bread which we break, is it not the communion of the Body of Christ? Because we, being many, are one bread and one body; for we all partake of the one bread. The bread is the communion, that is, the Sacrament of communion and association, both with the Head and with the Members of the mystical body, which is Christ. 1 Corinth. 12:13.

We have all been made to drink into one Spirit.

THE BREAD WHICH WE BREAK. Thirdly, the Supper was instituted for the remembrance of Christ and His Death, which cannot be truly declared apart from the purpose of repentance and gratitude. According to these sayings and examples:

Do this in remembrance of Me. Luke 22:19, 1 Corinth. 11:24.

Do this, as often as you drink it, in remembrance of Me. [25].

For as often as you eat this bread and drink this cup, you proclaim the Lord's death till He comes. [26].

Example of the primitive Church: And they were continuing steadfastly in the Apostles' doctrine and fellowship, and in breaking of bread, and in prayers. Acts 2:42.

Now on the first day of the week, when the disciples came together TO BREAK BREAD, Paul was speaking. Acts 20:7.

The bread which we klōmen break, we break, etc. 1 Cor. 10:16.

Regarding the purpose of repentance and gratitude, without which there can be no dokimasian examination/testing or exploration of one’s self, it is said:

But let a man examine himself, and so let him eat of that bread and drink of that cup. 1 Cor. 11:28.

You cannot drink the cup of the Lord and the cup of demons; you cannot be partakers of the Lord's table and of the table of demons. 1 Cor. 10:21.

Do not be unequally yoked together with unbelievers: for what fellowship has righteousness with lawlessness?