Śrīla Śukadeva Gosvāmī continued: Impelled by the illusory energy of Lord Viṣṇu, Prajāpati Dakṣa begot ten thousand sons in the womb of Pāñcajanī [Asiknī]. My dear King, these sons were called the Haryaśvas.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
श्रीशुक उवाच । तस्यां स पाञ्चजन्यां वै विष्णुमायोपबृंहितः । हर्यश्वसंज्ञानयुतं पुत्रानजनयद्विभुः
śrīśuka uvāca | tasyāṃ sa pāñcajanyāṃ vai viṣṇumāyopabṛṃhitaḥ | haryaśvasaṃjñānayutaṃ putrānajanayadvibhuḥ
SB 6.5.1