The Rule of St. Benedict - Chapter 45. Mistakes In The Oratory

(1) Should anyone make a mistake in a psalm, responsory, refrain or reading, he must make satisfaction there before all. If he does not use this occasion to humble himself, he will be subjected to more severe punishment
(2) for failing to correct by humility the wrong committed through negligence.
(3) Children, however, are to be whipped for such a fault.

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