Shiva Purana
वसिष्ठेन विरोधं तु कृतवान्नष्टचेतनः ॥ पुनः शिवप्रासादाच्च ब्राह्मणोऽभूत्स एव वै ॥ ३६ ॥
Becoming confounded in thought he rivalled with Vasiṣṭha. But thanks to Śiva’s grace he became a brahmin.
english translation
vasiSThena virodhaM tu kRtavAnnaSTacetanaH ॥ punaH zivaprAsAdAcca brAhmaNo'bhUtsa eva vai ॥ 36 ॥
hk transliteration by Sanscript