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