Srimad Bhagavatam Canto 10, Chapter 13, Text 42

SB 10.13.42

ita ete ’tra kutratya
man-maya-mohitetare
tavanta eva tatrabdam
kridanto visnuna samam
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
A similar number of boys and calves have been playing with Krsna for one whole year, yet they are different from the ones illusioned by my mystic potency. Who are they? Where did they come from?
 
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
Although appearing like calves, cows and cowherd boys, these were all Visnu. Actually they were visnu-tattva, not jiva-tattva. Brahma was surprised. “The original cowherd boys and cows,” he thought, “are still where I put them last year. So who is it that is now keeping company with Krsna exactly as before? Where have they come from?” Brahma was surprised that his mystic power had been neglected. Without touching the original cows and cowherd boys kept by Brahma, Krsna had created another assembly of calves and boys, who were all expansions of visnu-tattva. Thus Brahma’s mystic power was superseded.
 
Srimad Bhagavatam Canto 10, Chapter 13, Text 41
Srimad Bhagavatam Canto 10, Chapter 13, Text 43