Shiva Purana
कालोसि त्वं महाकालः कालकालो महेश्वर ॥ अतस्त्वमुग्रकलया मृत्योर्मृत्युर्भविष्यसि ॥ ५९ ॥
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