Once in Brajkul, Sri Radha was Bihar with Gopini and Krishna. Somehow this news reaches Radha's husband Kali fan Ayan Ghosh. But before Ayan came there, Krishna took the form of Kali and Radha started worshiping Kali in the form of Krishna with devotion.Vaishnava Bauls of Birbhum worship Krishna and Kali.
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