Harivamsha 85.6

85.6

kiṃvīryaḥ kālayavanaḥ kena jātaś ca vīryavān
yam asahyaṃ samālakṣya vyapayāto janārdanaḥ //

What was the strength of Kālayavana, and by whom was that valiant one fathered, / observing whom to be irresistible Janārdana retreated?”