उमामहेश्वरव्रतं—पञ्चाक्षरमन्त्रस्य माहात्म्यं, न्यासः, जपविधिः, सदाचारः, विनियोगः
न्यस्ते मन्त्रे ऽथ सुभगे शङ्करप्रतिमो भवेत् जन्मान्तरकृतं पापम् अपि नश्यति तत्क्षणात्
nyaste mantre 'tha subhage śaṅkarapratimo bhavet janmāntarakṛtaṃ pāpam api naśyati tatkṣaṇāt
おお吉祥なる者よ。マントラがニヤーサ(nyāsa)によって正しく安置されると、修行者はまるでシャṅカラ(Śaṅkara)そのものの御像のごとくなる。過去生に積んだ罪さえも、その瞬間に滅する。
Suta Goswami (narrating a Shaiva ritual teaching within the Purva-Bhaga context)
It states that mantra-nyāsa (ritual placement of the Shiva-mantra upon the body and worship) makes the sādhaka fit for Linga-pūjā by instantly burning accumulated pāpa, preparing the pashu (soul) to approach Pati (Shiva).
Shiva-tattva is presented as supremely purifying and transformative: by contact with Shiva-mantra, the limited pashu becomes ‘Śaṅkara-pratima’—a likeness of the Lord—indicating Shiva’s grace that cuts pāśa (bondage) and reveals divine purity.
Mantra-nyāsa—placing the mantra through touch and contemplation (a Pāśupata-leaning preparatory discipline) so the body-mind becomes a fit vessel for Shiva’s presence and for Linga-pūjā.