The Holy Rule
What the Manner of Excommunication Should Be
The degree of excommunication or punishment ought to be meted out according to the gravity of the offense, and to determine that is left to the judgment of the Abbot. If, however, anyone of the brethren is detected in smaller faults, let him be debarred from eating at the common table.
The following shall be the practice respecting one who is excluded from the common table: that he does not intone a psalm or an antiphon nor read a lesson in the oratory until he hath made satisfaction; let him take his meal alone, after the refection of the brethren; thus: if, for instance, the brethren take their meal at the sixth hour that brother will take his at the ninth, and if the brethren take theirs at the ninth, he will take his in the evening, until by due satisfaction he obtaineth pardon.