Srimad Bhagavatam Canto 10, Chapter 13, Text 37

SB 10.13.37

keyam va kuta ayata
daivi va nary utasuri
prayo mayastu me bhartur
nanya me ’pi vimohini
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
Who is this mystic power, and where has she come from? Is she a demigod or a demoness? She must be the illusory energy of My master, Lord Krsna, for who else can bewilder Me?
 
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
Balarama was surprised. This extraordinary show of affection, He thought, was something mystical, performed either by the demigods or some wonderful man. Otherwise, how could this wonderful change take place? “This maya might be some raksasi-maya,” He thought, “but how can raksasi-maya have any influence upon Me? This is not possible. Therefore it must be the maya of Krsna.” He thus concluded that the mystical change must have been caused by Krsna, whom Balarama considered His worshipable Personality of Godhead. He thought, “It was arranged by Krsna, and even I could not check its mystic power.” Thus Balarama understood that all these boys and calves were only expansions of Krsna.
Srimad Bhagavatam Canto 10, Chapter 13, Text 36
Srimad Bhagavatam Canto 10, Chapter 13, Text 38