Skandapurana 5.95.14

5.95.14

yenāhaṃ sarvalokasya hitārthaṃ tapa ādade ..
na svārthaṃ brāhmaṇaśreṣṭha satyenātmānamālabhe .. 14 ..

By means of which I may undertake austerity for the benefit of all people,
not for self-interest, O best of brahmins; I swear by truth by my own self.”