Shiva Purana
तदा सर्वाणि पापानि भस्मसाच्च भवंति हि ॥ तस्मात्काशीं नरस्सेवेत्कर्मनिर्मूलनीं ध्रुवम् ॥ ५१॥
Then his sins are reduced to ashes. Hence a man shall resort to Kāśī. That certainly debars Karmans to fructify.
english translation
tadA sarvANi pApAni bhasmasAcca bhavaMti hi ॥ tasmAtkAzIM narassevetkarmanirmUlanIM dhruvam ॥ 51॥
hk transliteration by Sanscript