कः प्राप्य काशीं दुर्मेधाः पुनस्त्यक्तुमिहेह ते । अनेकजन्मजनितकर्मनिर्मूलनक्षमाम्
kaḥ prāpya kāśīṃ durmedhāḥ punastyaktumiheha te | anekajanmajanitakarmanirmūlanakṣamām
Who, having attained Kāśī, would be so dull-witted as to abandon her again—she who can uproot the karmas accumulated over many births?
Skanda (deduced; Kāśīkhaṇḍa context)
Kāśī is celebrated as a karmic root-destroyer; spiritual wisdom is to value and remain connected to such liberating sacred space.
Kāśī (Vārāṇasī) as the preeminent kṣetra whose very association is said to uproot accumulated karma.
No single rite is specified; the implied discipline is continued residence/association (kṣetra-vāsa/saṃsevanā) and not abandoning Kāśī.