उमामहेश्वरव्रतं—पञ्चाक्षरमन्त्रस्य माहात्म्यं, न्यासः, जपविधिः, सदाचारः, विनियोगः
जपेदक्षरलक्षं वै चतुर्गुणितमादरात् नक्ताशी संयमी यश् च पौरश्चरणिकः स्मृतः
japedakṣaralakṣaṃ vai caturguṇitamādarāt naktāśī saṃyamī yaś ca pauraścaraṇikaḥ smṛtaḥ
Avec révérence, qu’on accomplisse un japa d’un lakṣa de syllabes, multiplié par quatre. Celui qui ne mange que la nuit et demeure maître de lui, dans la retenue, est reconnu comme ayant dûment entrepris le puraścaraṇa.
Suta Goswami (narrating Shiva-puja disciplines to the sages of Naimisharanya)
It defines a core Shaiva preparatory discipline (puraścaraṇa) for Linga-centered mantra practice: a regulated japa-count done with reverence and supported by vows, making the worship fit to yield mantra-siddhi through Śiva’s grace.
Implied is Śiva as Pati—the bestower of mantra-siddhi—who responds not merely to quantity but to ādarā (reverence) and saṁyama (inner restraint), indicating that liberation-oriented power arises when the pashu’s impurities and bonds (pāśa) are attenuated through disciplined practice.
Puraścaraṇa for mantra-japa: repeating the mantra by akṣara-count up to four lakhs, with the naktāśī observance (night-only meal) and saṁyama (self-restraint), aligning japa with Shaiva vrata and Pashupata-style discipline.