A formal precept which binds under pain of grave fault:

1. shall not be imposed unless there is question of matter which our laws regard as serious either in itself or from the circumstances, this after prudent consideration and sufficient investigation, and only in a case of true necessity;
2. must always be given in writing, for a specified period and must state clearly what is to be done or what is to be omitted;
3. must be given in the requisite formula: ‘we command (or we forbid) in virtue of obedience.’

A general and provincial chapter, and also superiors and others delegated by them, have power to give a formal precept.

A precept is invalid:

1. if it is not given in writing or if the formulas required by n. 294 is omitted;
2. if the local superior imposes a precept on an entire community without the previous consent of the prior provincial or, in a case of urgent necessity, of the conventual council; or if the prior provincial imposes it on a whole province without the consent of his council.