Hariścandra had no son and was therefore extremely morose. Once, therefore, following the advice of Nārada, he took shelter of Varuṇa and said to him, “My lord, I have no son. Would you kindly give me one?”
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
सोऽनपत्यो विषण्णात्मा नारदस्योपदेशतः । वरुणं शरणं यातः पुत्रो मे जायतां प्रभो
so'napatyo viṣaṇṇātmā nāradasyopadeśataḥ | varuṇaṃ śaraṇaṃ yātaḥ putro me jāyatāṃ prabho
SB 9.7.8