Be Careful Not To Be Angry Or Upset

If any of the friars, at the instigation of the enemy, fall into mortal sin, they must have recourse as soon as possible, without delay, to their provincial ministers, if it is a sin for which recourse to them has been prescribed for the friars. If the ministers are priests, they should impose a moderate penance on such friars; if they are not priests,they should see that a penance is imposed by some priest of the Order, as seems best to them before God. They must be careful not to be angry or upset because a friar has fallen into sin, because anger or annoyance in themselves or in others makes it difficult to be charitable.

Saint Francis of Assisi
The Rule of 1223
Chapter 7