Skandapurana 6.3.32.2

6.3.32.2

yudhiṣṭhira uvāca -
ko'sau siddhastadā brahmaṃstasmiṃstīrthe mahātapāḥ .
putraḥ kasya tu ko heturetadicchāmi veditum .. 32.2 ..

Yudhiṣṭhira said:
Who was he, of great austerity, that attained perfection then at that sacred ford, O holy one?
Whose son was he, and what was the reason? This I wish to know.