उमामहेश्वरव्रतं—पञ्चाक्षरमन्त्रस्य माहात्म्यं, न्यासः, जपविधिः, सदाचारः, विनियोगः
शुचौ देशे गृहे वापि काले सिद्धिकरे तिथौ नक्षत्रे शुभयोगे च सर्वदा दोषवर्जिते
śucau deśe gṛhe vāpi kāle siddhikare tithau nakṣatre śubhayoge ca sarvadā doṣavarjite
Whether in a pure place or even within one’s home, one should perform worship at a time that grants attainment—on an auspicious tithi, under a favourable nakṣatra and benefic yoga—always free from ritual defects. Such faultless conditions lead the paśu (bound soul) toward the grace of Śiva, the Pati.
Suta Goswami (narrating Shiva-puja guidelines within the Linga Purana discourse)
It establishes that Shiva-linga worship should be done in purity and under auspicious calendrical factors (tithi, nakṣatra, yoga), explicitly emphasizing doṣa-varjita (fault-free) conditions to ensure siddhi in worship.
By implying that attainment (siddhi) arises when worship is aligned with purity and dharmic order, it points to Shiva as Pati—the gracious Lord who responds to disciplined, faultless devotion and loosens the pasha (bondage) of the pashu (soul).
It highlights puja-kāla-niyama—choosing a pure place and an auspicious time for Shiva-puja—an external discipline that supports Pashupata-aligned sadhana by minimizing doṣa and stabilizing devotion.