Shiva Purana

siva.sh/siva-purana/saturda-samhita/9/70

कालराजं न यः काश्यां प्रतिभूताष्टमीकुजम् ।। भजेत्तस्य क्षयं पुण्यं कृष्णपक्षे यथा शशी।। ७० ।।

sanskrit

If a person neglects the worship of Kālarāja at Kāśī on every Tuesday and Bhūtāṣṭamī day, his merit decreases like the moon in the dark half.

english translation

kAlarAjaM na yaH kAzyAM pratibhUtASTamIkujam || bhajettasya kSayaM puNyaM kRSNapakSe yathA zazI|| 70 ||

hk transliteration by Sanscript