उमामहेश्वरव्रतं—पञ्चाक्षरमन्त्रस्य माहात्म्यं, न्यासः, जपविधिः, सदाचारः, विनियोगः
इन्द्रो ऽधिदैवतं छन्दो गायत्री गौतम ऋषिः मकारः कृष्णवर्णो ऽस्य स्थानं वै दक्षिणामुखम्
indro 'dhidaivataṃ chando gāyatrī gautama ṛṣiḥ makāraḥ kṛṣṇavarṇo 'sya sthānaṃ vai dakṣiṇāmukham
Pour ce membre du mantra, Indra est la divinité présidente ; le mètre est Gāyatrī ; le voyant est Gautama. Sa syllabe-graine est « ma », sa teinte est sombre, et son emplacement est sur la face du Sud—ainsi doit-on le fixer dans le culte du Liṅga.
Suta Goswami (narrating traditional Linga-puja vidhi to the sages of Naimisharanya)
It gives the viniyoga-style specifications (deity, metre, seer, seed syllable, color, and directional placement) used to perform mantra-nyāsa on the Liṅga, making the worship precise and ritually efficacious.
By prescribing nyāsa onto a specific mukha (southern face), it implies Shiva as Pati who receives and integrates multiple devatā-powers within the Liṅga, yet remains the single sovereign reality in whom these functions are installed.
Mantra-nyāsa with chandas–ṛṣi–devatā assignment and directional mukha placement—an outer puja act that mirrors inner yogic fixation (dhāraṇā) central to Shaiva sādhanā.