O King Parīkṣit, Hariścandra begged Varuṇa, “My lord, if a son is born to me, with that son I shall perform a sacrifice for your satisfaction.” When Hariścandra said this, Varuṇa replied, “Let it be so.” Because of Varuṇa’s benediction, Hariścandra begot a son named Rohita.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
यदि वीरो महाराज तेनैव त्वां यजे इति । तथेति वरुणेनास्य पुत्रो जातस्तु रोहितः
yadi vīro mahārāja tenaiva tvāṃ yaje iti | tatheti varuṇenāsya putro jātastu rohitaḥ
SB 9.7.9