Srimad Bhagavatam Canto 03, Chapter 03, Text 09

SB 3.3.9

tasv apatyany ajanayad
 atma-tulyani sarvatah
ekaikasyam dasa dasa
 prakrter vibubhusaya
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
Just to expand Himself according to His transcendental features, the Lord begot in each and every one of them ten offspring with exactly His own qualities.
Srimad Bhagavatam Canto 03, Chapter 03, Text 08
Srimad Bhagavatam Canto 03, Chapter 03, Text 10