Chapter 51: Those on local errands or work

Any who are sent on an errand which will allow them to return to the monastery on the same day must not eat outside, in spite of pressing invitations whatever their source, unless the superior has approved this.

(From Ch. 51 of Saint Benedict's Rule, trans. by Patrick Barry OSB, 1997.)

Benedict reminds me again about the profound importance of personal integrity, even in little ways, and especially when it would be easy just to "go along" without discernent.