Shiva Purana
तया परमया शक्त्या भगवंतं त्रियम्बकम् ॥ संचिन्त्य हृदये ब्रह्मा तताप परमं तपः ॥ ७ ॥
By that supreme energy, the Supreme Personality of Godhead, Triyambaka, was worshipped. Thinking in his heart Brahma performed great austerities.
english translation
tayA paramayA zaktyA bhagavaMtaM triyambakam ॥ saMcintya hRdaye brahmA tatApa paramaM tapaH ॥ 7 ॥
hk transliteration by Sanscript