Srimad-Bhagavatam: Canto 2 - Chapter 1 - Verse 35
Sanskrit:
विज्ञानशक्तिं महिमामनन्तिसर्वात्मनोऽन्त:करणं गिरित्रम् ।अश्वाश्वतर्युष्ट्रगजा नखानिसर्वे मृगा: पशव: श्रोणिदेशे ॥ ३५ ॥
ITRANS:
vijñāna-śaktiṁ mahim āmanantisarvātmano ’ntaḥ-karaṇaṁ giritramaśvāśvatary-uṣṭra-gajā nakhānisarve mṛgāḥ paśavaḥ śroṇi-deśe
Translation:
The principle of matter [mahat-tattva] is the consciousness of the omnipresent Lord, as asserted by the experts, and Rudradeva is His ego. The horse, mule, camel and elephant are His nails, and wild animals and all quadrupeds are situated in the belt zone of the Lord.