Shiva Purana

siva.sh/siva-purana/saturda-samhita/11/59

कालोसि त्वं महाकालः कालकालो महेश्वर ।। अतस्त्वमुग्रकलया मृत्योर्मृत्युर्भविष्यसि ।। ५९ ।।

sanskrit

You are Kāla but lord Śiva is Mahākāla and Kālakāla. Hence you will be death of death only through Śiva’s digit.

english translation

kAlosi tvaM mahAkAlaH kAlakAlo mahezvara || atastvamugrakalayA mRtyormRtyurbhaviSyasi || 59 ||

hk transliteration by Sanscript