ललितोपाख्याने जप-न्यास-योगप्रकरणम्
Lalitopākhyāna: Procedure of Japa, Nyāsa, and Yogic Installation
तलयोरपि विन्यस्य करशुद्धिपुरःसरम् / अग्निप्राकारपर्यन्तं कुर्यात्स्वास्त्रेण मन्त्रवित्
talayorapi vinyasya karaśuddhipuraḥsaram / agniprākāraparyantaṃ kuryātsvāstreṇa mantravit
Placing it also upon both palms, with hand-purification performed first, the knower of mantras should, by his own svāstra (weapon-mantra), fashion a protective enclosure of fire up to the outer boundary.