Canon 5
In accord with the most holy Council of Nicaea, clerics should not enter schemes or conspiracies that laymen use for their protection. Neither should someone of the lower rank rebuke or do wrong to the lord who is above him. If, after this very just decree has been passed, someone dares to do something against it, he should be corrected with the utmost severity, so that the sins will be eradicated by the penitence; that is, he [must spend] one year in a monastery where he will know [how to] give his pride back to where it came from, namely, to the Devil, and learn humility, as through it [i.e. penitence] he will be deemed worthy [not] to taste [spiritual] death.
(trans. J. Szafranowski)