Adhyaya 84: शिवव्रतकथनम्
Uma–Maheshvara Vrata, Shula-dana, and Month-wise Ekabhakta Vrata
पौर्णमास्याममावास्यां वर्षमेकमतन्द्रिता उपवासरता नारी नरो ऽपि द्विजसत्तमाः
paurṇamāsyāmamāvāsyāṃ varṣamekamatandritā upavāsaratā nārī naro 'pi dvijasattamāḥ
Pada hari purnima dan hari amavasya, selama setahun penuh tanpa lalai, seorang wanita—atau juga seorang lelaki, wahai yang terbaik antara yang dua kali lahir—yang sentiasa berjaga dan tekun berpuasa (upavāsa) menjadi layak menerima rahmat yang meleraikan ikatan pāśa pada paśu, melalui keteguhan amalan yang ditujukan kepada Pati, Śiva.
Suta Goswami
It prescribes a year-long discipline of fasting on Pūrṇimā and Amāvāsyā as a purificatory vrata that supports Śiva-pūjā and ripens the devotee for Śiva’s anugraha (grace).
Śiva is implied as Pati—the liberating Lord—whose grace is approached through steadiness (atandritā) and self-restraint, weakening pāśa (bondage) that constrains the paśu (individual soul).
Upavāsa as a vrata: periodic fasting on lunar junctions (full and new moon) for a year, a tapas-oriented practice aligned with Shaiva observance and preparatory to deeper Pāśupata discipline.