When Kaal Bhairav was charged of Brahma Hatya, he came to Kashi to hunt penance and it was only inside the holy land of Kashi that he was finally free of charge from the sin of the killing. From that time on, Kaal Bhairav is said to reside in Kashi, https://archerwqgse.qodsblog.com/29894148/the-ultimate-guide-to-bhairav