प्रत्याहारवर्णनम्
Pratyāhāra—Cosmic Withdrawal / Dissolution Sequence
यस्मात्पूर्यनुशेते च तस्मात्पुरुष उच्यते / पुरप्रत्ययिको यस्मात्पुरुषेत्यभिधीयते
yasmātpūryanuśete ca tasmātpuruṣa ucyate / purapratyayiko yasmātpuruṣetyabhidhīyate
Because he dwells within the purī—the city of the body—he is called Puruṣa. And because he is the very ground of the notion of pura (the city), he too is named Puruṣa.