In the month of Kārtika, after observing that vow for one year, after observing a fast for three nights and after bathing in the Yamunā, Mahārāja Ambarīṣa worshiped the Supreme Personality of Godhead, Hari, in Madhuvana.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
व्रतान्ते कार्तिके मासि त्रिरात्रं समुपोषितः । स्नातः कदाचित्कालिन्द्यां हरिं मधुवनेऽर्चयत्
vratānte kārtike māsi trirātraṃ samupoṣitaḥ | snātaḥ kadācitkālindyāṃ hariṃ madhuvane'rcayat
SB 9.4.30