उमामहेश्वरव्रतं—पञ्चाक्षरमन्त्रस्य माहात्म्यं, न्यासः, जपविधिः, सदाचारः, विनियोगः
गले मध्ये तथाङ्गुष्ठे तर्जन्याद्याङ्गुलीषु च अङ्गुष्ठेन करन्यासं कुर्यादेव विचक्षणः
gale madhye tathāṅguṣṭhe tarjanyādyāṅgulīṣu ca aṅguṣṭhena karanyāsaṃ kuryādeva vicakṣaṇaḥ
識別ある修行者は、カラ・ニヤーサ(触れて真言を安置する法)を行うべし。喉の中央、親指、そして人差し指から始まる諸指に、親指をもって儀礼の触れとして真言を置く。
Suta Goswami (narrating Shiva-puja-vidhi to the sages of Naimisharanya)
It teaches kara-nyāsa as a required internalizing step of Shiva-mantra before Linga-puja, sanctifying the worshipper’s body as a fit vessel for invoking Pati (Shiva) and loosening pasha (bondage) for the pashu (soul).
By prescribing mantra-imposition on the throat and fingers, it implies Shiva-tattva is approached through mantra embodied in the practitioner—Shiva as Pati is invoked not only externally in the Linga but also established within the worshipper’s own faculties of speech and action.
Kara-nyāsa (mantra placement on thumb and fingers) along with throat placement—an angic practice used in Shaiva puja and Pashupata-oriented sadhana to stabilize mantra, purify action-organs, and prepare for Linga-archana.