उमामहेश्वरव्रतं—पञ्चाक्षरमन्त्रस्य माहात्म्यं, न्यासः, जपविधिः, सदाचारः, विनियोगः
ओमित्येकाक्षरं मन्त्रं स्थितः सर्वगतः शिवः मन्त्रे षडक्षरे सूक्ष्मे पञ्चाक्षरतनुः शिवः
omityekākṣaraṃ mantraṃ sthitaḥ sarvagataḥ śivaḥ mantre ṣaḍakṣare sūkṣme pañcākṣaratanuḥ śivaḥ
一音のマントラ「オーム」において、遍在の主シヴァは確立して住す。また微妙なる六音のマントラにおいて、シヴァは五音の姿(パンチャークシャリー)として身をもって現前する。
Suta Goswami (narrating the Linga Purana’s teaching to the sages of Naimisharanya)
It anchors Linga-upāsanā in mantra-upāsanā: the Linga’s all-pervading Shiva-tattva is approached through Om and through the Pañcākṣarī (Namaḥ Śivāya), making japa a direct mode of worship.
Shiva is presented as sarvagata (all-pervading) and simultaneously accessible in subtle mantra-form—Pati who pervades all while revealing himself through sound (śabda) to liberate the paśu from pāśa.
Mantra-japa as Pāśupata-oriented sādhana: contemplation of Om along with steady repetition of Namaḥ Śivāya as the subtle embodiment of Shiva for inner purification and release from bondage.