Nārada Muni instructed: My dear boy, in the waters of the Yamunā River, which is known as Kālindī, you should take three baths daily because the water is very auspicious, sacred and clear. After bathing, you should perform the necessary regulative principles for aṣṭāṅga-yoga and then sit down on your āsana [sitting place] in a calm and quiet position.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
स्नात्वानुसवनं तस्मिन् कालिन्द्याः सलिले शिवे । कृत्वोचितानि निवसन्नात्मनः कल्पितासनः
snātvānusavanaṃ tasmin kālindyāḥ salile śive | kṛtvocitāni nivasannātmanaḥ kalpitāsanaḥ
SB 4.8.43