उमामहेश्वरव्रतं—पञ्चाक्षरमन्त्रस्य माहात्म्यं, न्यासः, जपविधिः, सदाचारः, विनियोगः
अङ्गुलीनां च सर्वेषां तथा चाद्यन्तपर्वसु सबिन्दुकानि बीजानि पञ्च मध्यमपर्वसु
aṅgulīnāṃ ca sarveṣāṃ tathā cādyantaparvasu sabindukāni bījāni pañca madhyamaparvasu
For all the fingers, at the first and last joints one should place the bīja-syllables furnished with bindu (nasalization); and at the five middle joints one should place the bīja-syllables (as prescribed).
Suta Goswami (narrating Shiva-puja vidhi as taught in the Linga Purana tradition)
It prescribes finger-joint nyāsa—placing bīja-mantras on the joints—so the worshipper’s hands become ritually empowered to serve as instruments of Shiva’s puja.
By mandating bīja-and-bindu placement, it implies Shiva as Pati is accessed through mantra-śakti: the subtle sound-power that purifies the pashu (individual soul) and loosens pāśa (bondage) during worship.
Aṅga-nyāsa/karanyāsa (hand and limb mantra-installation), a core Shaiva preparatory practice that supports focused japa, mudrā, and inner alignment in Pāśupata-oriented Shiva-puja.