Skandapurana 5.142.10

5.142.10

hāṭakeśvarajaṃ kṣetraṃ samāsādya sa saddvijāḥ ..
bālye'pi vayasi prāpte samārebhe mahattapaḥ .. 6.143.10 ..

Having reached the sacred field originating from Hāṭakeśvara, O good brahmins, / he undertook great austerity even when he had reached his childhood age. (10)