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." (PT)
App reference (PT): Book 6, Hadith 5 (PT)
USC-MSA web (English) reference: Book 6, Hadith 5 (PT)
Arabic reference (PT): Book 6, Hadith 251 (PT)