रजनीं तां महाभागा नन्दसुनन्दकादय: ॥ ४ ॥
jalaṁ prāśya yata-vratāḥ
rajanīṁ tāṁ mahā-bhāgā
Nanda, Sunanda and the other greatly fortunate cowherds spent that night on the bank of the Sarasvatī, strictly observing their vows. They fasted, taking only water.
Śrīla Viśvanātha Cakravartī explains that Sunanda is the younger brother of Nanda Mahārāja.