Yahya related to me from Malik that Yazid ibn Ruman said, "Thepeople used to watch the night in prayer during Ramadan for twenty-three rakas in the time of Umar ibn al-Khattab." (ES)
App reference (ES): Book 6, Hadith 5 (ES)
USC-MSA web (English) reference: Book 6, Hadith 5 (ES)
Arabic reference (ES): Book 6, Hadith 251 (ES)