The Rule of St. Benedict - Chapter 29. Readmission Of Brothers Who Leave The Monastery

(1) If a brother, following his own evil ways, leaves the monastery but then wishes to return, he must first promise to make full amends for leaving.
(2) Let him be received back, but as a test of his humility he should be given the last place.
(3) If he leaves again, or even a third time, he should be readmitted under the same conditions. After this, however, he must understand that he will be denied all prospect of return.

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