उमामहेश्वरव्रतं—पञ्चाक्षरमन्त्रस्य माहात्म्यं, न्यासः, जपविधिः, सदाचारः, विनियोगः
प्राङ्मुखोदङ्मुखो वापि न्यासकर्म समाचरेत् स्मरेत् पूर्वम् ऋषिं छन्दो दैवतं बीजमेव च
prāṅmukhodaṅmukho vāpi nyāsakarma samācaret smaret pūrvam ṛṣiṃ chando daivataṃ bījameva ca
Facing east or facing north, one should perform the rite of nyāsa. First, one should recollect the seer (ṛṣi), the metre (chandas), the presiding deity (daivatam), and the seed-syllable (bīja) of the mantra—so that the Pashu (bound soul) may align the body and mind as a fit vessel for the worship of Pati, Lord Śiva.
Suta Goswami (narrating Shiva-puja/nyasa procedure within the Linga Purana’s discourse)
It establishes the correct pre-condition for Linga-puja: nyāsa done while facing auspicious directions, preceded by remembering the mantra’s ṛṣi, chandas, devatā, and bīja—so worship becomes properly consecrated rather than merely external.
By identifying Śiva as the mantra’s presiding deity (daivatam), it points to Śiva-tattva as the governing Presence invoked through sound (mantra), making inner recollection and alignment essential for the Pashu to approach Pati.
Nyāsa—ritual installation of mantra in the limbs/body—along with the preliminary mantra-anga remembrance (ṛṣi–chandas–devatā–bīja), a key preparatory discipline aligned with Shaiva mantra-sādhana and Pashupata-oriented worship.