One of the ten types of Sāmācārī (rules of conduct qua etiquette, formality and convention); on being appointed by the Guru (2) for a specific work, the disciple has to seek his permission again while biggining it.
guruniyukto 'pi hi punah pravrttikāle pratiprccha- tyeva gurutn, sa hi kāryāntaramapyādiśet sid- dham vā tadanyatah syāt.
(U 26.5 SāVṛ Pa 534)