अधोलोकवर्णनम् (Adholoka-varṇana) — Description of the Lower Worlds and Cosmographic Measures
आभूतसंप्लवान्ते तु क्षीयं ते ह्यूर्ध्वरेतसः / उर्द्ध्वोत्तरमृषिभ्यस्तु ध्रुवो यत्र स वै स्मृतः
ābhūtasaṃplavānte tu kṣīyaṃ te hyūrdhvaretasaḥ / urddhvottaramṛṣibhyastu dhruvo yatra sa vai smṛtaḥ
At the end of the great cosmic dissolution, the splendor of the ūrdhvaretas ascetics wanes; above the seers, toward the higher northern quarter, where Dhruva abides—there he is remembered as Dhruva.