Srimad-Bhagavatam: Canto 3 - Chapter 1 - Verse 21
Sanskrit:
सृष्ट्वाग्रे महदादीनि सविकाराण्यनुक्रमात् ।तेभ्यो विराजमुद्धृत्य तमनु प्राविशद्विभु: ॥ २१ ॥
ITRANS:
sṛṣṭvāgre mahad-ādīnisa-vikārāṇy anukramāttebhyo virājam uddhṛtyatam anu prāviśad vibhuḥ
Translation:
After creating the total material energy, the mahat-tattva, and thereby manifesting the gigantic universal form with senses and sense organs, the Supreme Lord entered within it.
Purport:
Fully satisfied by the answers of the sage Maitreya, Vidura wanted to understand the remaining portions of the creative function of the Lord, and he took the clue from the previous topics.