ललितोपाख्याने जप-न्यास-योगप्रकरणम्
Lalitopākhyāna: Procedure of Japa, Nyāsa, and Yogic Installation
तद्बहिर्विन्न्यसेद्धीमानायुधानां चतुष्टयम् / न्यसेदग्न्यादिकोणेषु मध्ये पीठचतुष्टयम्
tadbahirvinnyaseddhīmānāyudhānāṃ catuṣṭayam / nyasedagnyādikoṇeṣu madhye pīṭhacatuṣṭayam
Outside that, the wise one should place the set of four weapons. And he should install the four pīṭhas in the corners—beginning with the fire-corner—and in the center.