Srimad Bhagavatam Canto 03, Chapter 08, Text 13

SB 3.8.13

tasyartha-suksmabhinivista-drster
 antar-gato ’rtho rajasa taniyan
gunena kalanugatena viddhah
 susyams tadabhidyata nabhi-desat
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
The subtle subject matter of creation, on which the Lord’s attention was fixed, was agitated by the material mode of passion, and thus the subtle form of creation pierced through His abdomen.
Srimad Bhagavatam Canto 03, Chapter 08, Text 12
Srimad Bhagavatam Canto 03, Chapter 08, Text 14