उमामहेश्वरव्रतं—पञ्चाक्षरमन्त्रस्य माहात्म्यं, न्यासः, जपविधिः, सदाचारः, विनियोगः
उत्पत्त्यादित्रिभेदेन वक्ष्यते ते वरानने न्यसेत्पूर्वं करन्यासं देहन्यासम् अनन्तरम्
utpattyāditribhedena vakṣyate te varānane nyasetpūrvaṃ karanyāsaṃ dehanyāsam anantaram
麗しき面貌の者よ(varānanā)、顕現の作法(utpatti)より始まる三種の方法を汝に説こう。まずカラ・ニヤーサ(kara-nyāsa)を行い、その後にデーハ・ニヤーサ(deha-nyāsa)を行うべし。
Suta Goswami (narrating an internal Shaiva-ritual instruction traditionally framed as Shiva teaching the Devi)
It establishes the correct ritual sequence: before external Linga-puja, the sādhaka purifies and consecrates the instruments of worship (hands) and the worshipper’s own body through nyāsa, making the body fit as a seat for Śiva-mantra.
By prescribing nyāsa, it implies Śiva-tattva as immanent and installable through mantra-śakti: the Pati (Śiva) is invoked to pervade the sādhaka’s limbs, loosening pāśa (bondage) that binds the paśu (individual soul).
Mantra-nyāsa—specifically kara-nyāsa followed by deha-nyāsa—an inner ritual aligned with Pāśupata-oriented discipline where the body is treated as a sacred field for the installation of Śiva’s mantras prior to japa and Linga-archana.