Srimad-Bhagavatam: Canto 5 - Chapter 1 - Verse 11
Sanskrit:
यत्र ह वाव न भयमहोरात्रादिभि: कालविभागैरुपलक्ष्यते ॥ ११ ॥
ITRANS:
yatra ha vāva na bhayam aho-rātrādibhiḥ kāla-vibhāgair upalakṣyate.
Translation:
Since there is no sunshine in those subterranean planets, time is not divided into days and nights, and consequently fear produced by time does not exist.