The Rule of Saint Benedict, Chapter 61

How Pilgrim Monks Are To Be Received

But if as a guest he was found exacting or prone to vice,
not only should he be denied membership in the community,
but he should even be politely requested to leave,
lest others be corrupted by his evil life.

If, however, she has not proved to be the kind
who deserves to be put out,
he should not only on his own application be received
as a member of the community,
but he should even be persuaded to stay,
that the others may be instructed by his example,
and because in every place it is the same Lord who is served,
the same King for whom the battle is fought.

Moreover, if the Abbot perceives that he is worthy,
he may put him in a somewhat higher rank.
the Abbot may establish them in a higher rank
than would be theirs by date of entrance
if he perceives that their life is deserving.

Let the Abbot take care, however,
never to receive a brother from another known monastery
as a member of his community
without the consent of his Abbot or a letter of recommendation;
for it is written,
"Do not to another what you would not want done to yourself" (Tob. 4:16).