Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 20
Sanskrit:
सत्यमर्ककरारक्तमुत्तराहनुवद् धनम् ।अधराहनुवद्रोधस्तत्प्रतिच्छाययारुणम् ॥ २० ॥
ITRANS:
satyam arka-karāraktamuttarā-hanuvad ghanamadharā-hanuvad rodhastat-praticchāyayāruṇam
Translation:
Thereafter they decided: Dear friends, this is certainly an animal sitting here to swallow us all. Its upper lip resembles a cloud reddened by the sunshine, and its lower lip resembles the reddish shadows of a cloud.