The Compendium of Caraka 3.3.3

3.3.3

janapadamaṇḍale pañcālakṣetre dvijātivarādhyuṣite kāmpilyarājadhānyāṃ bhagavān punarvasurātreyo 'antevāsigaṇaparivṛtaḥ paścime gharmamāse gaṅgātīre vanavicāramanuvicarañchiṣyamagniveśamabravīt//

In the Pañcāla territory, within the territory of the community inhabited by eminent twice-born people, in the royal capital of Kāmpilya, during the last summer month, the venerable Punarvasu Ātreya, surrounded by a group of disciples, while wandering through the forest along the bank of the Gaṅgā, said to his disciple Agniveśa: