उमामहेश्वरव्रतं—पञ्चाक्षरमन्त्रस्य माहात्म्यं, न्यासः, जपविधिः, सदाचारः, विनियोगः
अङ्गन्यासं ततः पश्चाद् अक्षराणां विधिक्रमात् मूर्धादिपादपर्यन्तम् उत्पत्तिन्यास उच्यते
aṅganyāsaṃ tataḥ paścād akṣarāṇāṃ vidhikramāt mūrdhādipādaparyantam utpattinyāsa ucyate
अङ्गन्यासं ततः पश्चाद् अक्षराणां विधिक्रमात्। मूर्धादिपादपर्यन्तम् उत्पत्तिन्यास उच्यते॥
Suta Goswami (narrating Shiva-puja vidhi to the sages of Naimisharanya)
It teaches the preparatory inner-ritual for Linga-puja: installing the mantra’s syllabic power on the sādhaka’s body so the worshipper becomes fit to approach Pati (Shiva) with a consecrated mantra-body.
By prescribing utpatti-nyāsa, it implies Shiva as Pati whose śakti manifests as mantra and pervades the whole body from head to feet—revealing Shiva-tattva as all-pervading consciousness that can be invoked and stabilized through disciplined ritual awareness.
Aṅga-nyāsa followed by utpatti-nyāsa—sequential placement of mantra syllables across the body (from crown to feet), a Shaiva mantra-yoga method used in Shiva-puja and Pashupata-oriented sādhanā.