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
सर्वास्वङ्गुलिषु च आद्यन्तपर्वसु सबिन्दुकानि बीजानि न्यसेत्; मध्यमपर्वसु पञ्च बीजानि यथाविधि विन्यसेत्।
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.