Shiva Purana
तावत्कालं गतश्चोर्ध्वं तस्यांतं ज्ञातुमिच्छया ॥ श्रांतोत्यंतमदृष्ट्वांतं पापताधः पितामहः ॥ ४० ॥
Meanwhile, Brahmā too was going up to know his top. But unable to see the end he became exhausted and fell down.
english translation
tAvatkAlaM gatazcordhvaM tasyAMtaM jJAtumicchayA ॥ zrAMtotyaMtamadRSTvAMtaM pApatAdhaH pitAmahaH ॥ 40 ॥
hk transliteration by Sanscript