Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 21
Sanskrit:
प्रतिस्पर्धेते सृक्कभ्यां सव्यासव्ये नगोदरे ।तुङ्गशृङ्गालयोऽप्येतास्तद्दंष्ट्राभिश्च पश्यत ॥ २१ ॥
ITRANS:
pratispardhete sṛkkabhyāṁsavyāsavye nagodaretuṅga-śṛṅgālayo ’py etāstad-daṁṣṭrābhiś ca paśyata
Translation:
On the left and right, the two depressions resembling mountain caves are the corners of its mouth, and the high mountain peaks are its teeth.