The fifth (out of the eleven) of the Upāsaka-pratima (intensive course of spiritual practice prescribed for the lay follower);
in which the practitioner undertakes a severe practice of Kāyotsarga (2) (austerity qua abandonment of body).
pañca māsāṃścatuṣparvyāṃ gṛhe taddvāre catuṣpathe vā parīṣahopasargādiniṣprakampakāyotsargaḥ pūrvoktapratimānuṣṭhānaṃ pālayan sakalaṇ rātrimāsta iti pañcamī.
(Yośā 3.148 Vṛ p.762)