Srimad-Bhagavatam: Canto 6 - Chapter 1 - Verse 27-29
Sanskrit:
महाप्राणो महावीर्यो महासर्प इव द्विपम् ।कृत्वाधरां हनुं भूमौ दैत्यो दिव्युत्तरां हनुम् ।नभोगम्भीरवक्त्रेण लेलिहोल्बणजिह्वया ॥ २७ ॥दंष्ट्राभि: कालकल्पाभिर्ग्रसन्निव जगत्त्रयम् ।अतिमात्रमहाकाय आक्षिपंस्तरसा गिरीन् ॥ २८ ॥गिरिराट् पादचारीव पद्भ्यां निर्जरयन् महीम् ।जग्रास स समासाद्य वज्रिणं सहवाहनम् ॥ २९ ॥
ITRANS:
mahā-prāṇo mahā-vīryomahā-sarpa iva dvipamkṛtvādharāṁ hanuṁ bhūmaudaityo divy uttarāṁ hanum
Translation:
Vṛtrāsura was very powerful in physical strength and influence. He placed his lower jaw on the ground and his upper jaw in the sky. His mouth became very deep, like the sky itself, and his tongue resembled a large serpent. With his fearful, deathlike teeth, he seemed to be trying to devour the entire universe. Thus assuming a gigantic body, the great demon Vṛtrāsura shook even the mountains and began crushing the surface of the earth with his legs, as if he were the Himālayas walking about. He came before Indra and swallowed him and Airāvata, his carrier, just as a big python might swallow an elephant.