Durvāsā Muni gladly accepted the request of Mahārāja Ambarīṣa, but to perform the regulative ritualistic ceremonies he went to the river Yamunā. There he dipped into the water of the auspicious Yamunā and meditated upon the impersonal Brahman.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
प्रतिनन्द्य स तद्याच्ञां कर्तुमावश्यकं गतः । निममज्ज बृहद्ध्यायन् कालिन्दीसलिले शुभे
pratinandya sa tadyācñāṃ kartumāvaśyakaṃ gataḥ | nimamajja bṛhaddhyāyan kālindīsalile śubhe
SB 9.4.37