Shiva Purana

siva.sh/siva-purana/kotirudra-samhita/23/46

सर्वेषां कर्मणां नाशो नास्ति काशीं पुरीं विना ।। सर्वं च सुलभं तीर्थं दुर्ल्लभा काशिका पुरी ।। ४६।।

sanskrit

Except in Kāśī in no other place can all the actions be wiped off. The other holy centres are easily accessible but the city of Kāśī is difficult of access.

english translation

sarveSAM karmaNAM nAzo nAsti kAzIM purIM vinA || sarvaM ca sulabhaM tIrthaM durllabhA kAzikA purI || 46||

hk transliteration by Sanscript