Shiva Purana
तपःप्रभावाद्देवस्य प्रसादाच्च महर्षयः ॥ अत्याश्रमोचितज्ञानं पवित्रं पापनाशनम् ॥ ७२ ॥
By the power of his austerities and by the grace of the god the great sages Knowledge appropriate to the most austere is pure and destroys sins.
english translation
tapaHprabhAvAddevasya prasAdAcca maharSayaH ॥ atyAzramocitajJAnaM pavitraM pApanAzanam ॥ 72 ॥
hk transliteration by Sanscript