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