Srimad Bhagavatam Canto 09, Chapter 04, Text 30

SB 9.4.30

vratante kartike masi
 tri-ratram samupositah
snatah kadacit kalindyam
 harim madhuvane ’rcayat
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
In the month of Kartika, after observing that vow for one year, after observing a fast for three nights and after bathing in the Yamuna, Maharaja Ambarisa worshiped the Supreme Personality of Godhead, Hari, in Madhuvana.
Srimad Bhagavatam Canto 09, Chapter 04, Text 29
Srimad Bhagavatam Canto 09, Chapter 04, Text 31-32