Srimad-Bhagavatam: Canto 6 - Chapter 1 - Verse 26

Sanskrit:

दोर्भ्यामुत्कृत्तमूलाभ्यां बभौ रक्तस्रवोऽसुर: ।छिन्नपक्षो यथा गोत्र: खाद्भ्रष्टो वज्रिणा हत: ॥ २६ ॥

ITRANS:

dorbhyām utkṛtta-mūlābhyāṁbabhau rakta-sravo ’suraḥchinna-pakṣo yathā gotraḥkhād bhraṣṭo vajriṇā hataḥ

Translation:

Vṛtrāsura, bleeding profusely, his two arms cut off at their roots, looked very beautiful, like a flying mountain whose wings have been cut to pieces by Indra.

Purport:

It appears from the statement of this verse that sometimes there are flying mountains and that their wings are cut by the thunderbolt of Indra. Vṛtrāsura’s huge body resembled such a mountain.