Srimad Bhagavatam Canto 10, Chapter 13, Text 27

SB 10.13.27

ittham atmatmanatmanam
vatsa-pala-misena sah
palayan vatsapo varsam
cikride vana-gosthayoh
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
In this way, Lord Sri Krsna, having Himself become the cowherd boys and groups of calves, maintained Himself by Himself. Thus He continued His pastimes, both in Vrndavana and in the forest, for one year.
 
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
Everything was Krsna. The calves, the cowherd boys and their maintainer Himself were all Krsna. In other words, Krsna expanded Himself in varieties of calves and cowherd boys and continued His pastimes uninterrupted for one year. As stated in Bhagavad-gita, Krsna’s expansion is situated in everyone’s heart as the Supersoul. Similarly, instead of expanding Himself as the Supersoul, He expanded Himself as a portion of calves and cowherd boys for one continuous year.
Srimad Bhagavatam Canto 10, Chapter 13, Text 26
Srimad Bhagavatam Canto 10, Chapter 13, Text 28