Shiva Purana
स्रष्टुकामः पुनर्ब्रह्मा तताप परमं तपः ॥ तस्यैवं तप्यमानस्य न किंचित्समवर्तत ॥ २२ ॥
Desiring to create again, Lord Brahmā underwent severe austerities. While he was thus tormented, nothing happened to him.
english translation
sraSTukAmaH punarbrahmA tatApa paramaM tapaH ॥ tasyaivaM tapyamAnasya na kiMcitsamavartata ॥ 22 ॥
hk transliteration by Sanscript