Musannaf Ibn Abi Shaybah 31620 — The supplication on climbing Safa

Mughirah said that al-Hakam said to Ibrahim: "I saw Abu Bakr bin Abd al-Rahman bin al-Harith on the hill of Safa, and he stood for as long as it takes a man to recite one hundred and twenty verses." Ibrahim said: "Indeed, he is a faqih (man of deep understanding)."