When Kaal Bhairav was charged of Brahma Hatya, he came to Kashi to seek penance and it was only while in the holy land of Kashi that he was eventually no cost from the sin of the killing. From that point on, Kaal Bhairav is alleged to reside in Kashi, https://spencerdghfc.tblogz.com/5-easy-facts-about-bhairav-described-44187949