Shiva Purana

siva.sh/siva-purana/kotirudra-samhita/23/52

एकोऽपि ब्राह्मणो येन काश्यां संवासितः प्रिये ।। काशीवासमवाप्यैव ततो मुक्तिं स विंदति ।। ५२।।

sanskrit

O beloved, if even a single brahmin is afforded shelter and residence at Kāśī, the man who affords shelter and residence, gets the benefit of residence in Kāśī himself and thence he attains salvation.

english translation

eko'pi brAhmaNo yena kAzyAM saMvAsitaH priye || kAzIvAsamavApyaiva tato muktiM sa viMdati || 52||

hk transliteration by Sanscript