Srimad Bhagavatam Canto 10, Chapter 77, Text 24

SB 10.77.24

katham ramam asambhrantam
 jitvajeyam surasuraih
salvenalpiyasa nitah
 pita me balavan vidhih
 
Translation: 
 
[Lord Krsna said:] Balarama is ever vigilant, and no demigod or demon can defeat Him. So how could this insignificant Salva defeat Him and abduct My father? Indeed, fate is all-powerful!
Srimad Bhagavatam Canto 10, Chapter 77, Text 23
Srimad Bhagavatam Canto 10, Chapter 77, Text 25