Srimad Bhagavatam Canto 10, Chapter 16, Text 22

SB 10.16.22

krsna-pranan nirvisato
nandadin viksya tam hradam
pratyasedhat sa bhagavan
ramah krsnanubhava-vit
 
Translation: 
 
Lord Balarama then saw that Nanda Maharaja and the other cowherd men, who had dedicated their very lives to Krsna, were beginning to enter the serpent’s lake. As the Supreme Personality of Godhead, Lord Balarama fully knew Lord Krsna’s actual power, and therefore He restrained them.
 
Purport: 
 
Srila Sanatana Gosvami explains that Lord Balarama checked some of the cowherd men by speaking to them, others by physically holding them and still others by casting upon them His potent smiling glance. Distraught over the situation, they were prepared to give up their lives for Lord Krsna by entering the serpent’s lake.
Srimad Bhagavatam Canto 10, Chapter 16, Text 21
Srimad Bhagavatam Canto 10, Chapter 16, Text 23