Shiva Purana
अनादित्वादनंतत्वादज्ञेयत्वाच्च कृत्स्नशः ॥ मन्वंतराणि कल्पाश्च न शक्या वचनात्पृथक् ॥ ४ ॥
The Manvantaras and Kalpas have no beginning or end. Being unknowable they cannot be narrated separately.
english translation
anAditvAdanaMtatvAdajJeyatvAcca kRtsnazaH ॥ manvaMtarANi kalpAzca na zakyA vacanAtpRthak ॥ 4 ॥
hk transliteration by Sanscript