Srimad Bhagavatam Canto 03, Chapter 07, Text 21

SB 3.7.21

srstvagre mahad-adini
 sa-vikarany anukramat
tebhyo virajam uddhrtya
 tam anu pravisad vibhuh
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
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 by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
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.
Srimad Bhagavatam Canto 03, Chapter 07, Text 20
Srimad Bhagavatam Canto 03, Chapter 07, Text 22