Canto 1 - Boyhood
Bāla-kāṇḍa
Chapter 38: The History of Sagara
Text 1.38.14

षष्टिं पुत्रसहस्राणि सुपर्णभगिनी तदा।
महोत्साहान्कीर्तिमन्तो जग्राह सुमतिः सुतान्॥

ṣaṣṭiṁ putra-sahasrāṇi suparṇa-bhaginī tadā
mahotsāhān
kīrtimanto jagrāha sumatiḥ sutān

ṣaṣṭim putra-sahasrāṇi = sixty thousand sons; suparṇa-bhaginī = Suparṇa’s sister; tadā = then; mahā-utsāhān = filled with great prowess; kīrtimantaḥ = and fame; jagrāha = accepted the benediction to have; sumatiḥ = Sumati; sutān = sons.

Suparṇa’s sister Sumati then accepted [the benediction to have] 60,000 sons filled with great prowess and fame.

Suparṇa is Garuḍa.