Elsewhere, Dhruva Mahārāja, having arrived at Madhuvana, took his bath in the river Yamunā and observed fasting in the night with great care and attention. After that, as advised by the great sage Nārada, he engaged himself in worshiping the Supreme Personality of Godhead.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
तत्राभिषिक्तः प्रयतस्तामुपोष्य विभावरीम् । समाहितः पर्यचरदृष्यादेशेन पूरुषम्
tatrābhiṣiktaḥ prayatastāmupoṣya vibhāvarīm | samāhitaḥ paryacaradṛṣyādeśena pūruṣam
SB 4.8.71