The eleventh vow of the lay follower;
a specialised course of sādhanā (spiritual practice) undertaken by a lay follower for one day and night (starting from the sun-rise of the first day up to the sun-rise of the second day), during which, relinquishing food, body-care and sinful activities, he observes celibacy.
uddiṣṭetyamāvāsyā paripūrṇamiti-ahorātraṃ yāvat āhāraśarīrasaṃskāratyāgabrahmacaryāvyāpāralaksanabhedopetam.
(Sthā 4.636 Vṛ Pa 225)
posahovavāse cauvvihe pannatte, tamjahā- āhāraposahe sanrasakkāraposahe bambhaceraposahe avvāvāraposahe.
(Āva Pari 23)