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SB 10.34.4
usuh sarasvati-tire
jalam prasya yata-vratah
rajanim tam maha-bhaga
nanda-sunandakadayah
Translation:
Nanda, Sunanda and the other greatly fortunate cowherds spent that night on the bank of the Sarasvati, strictly observing their vows. They fasted, taking only water.
Purport:
Srila Visvanatha Cakravarti explains that Sunanda is the younger brother of Nanda Maharaja.