Chapter 20: The Book of Qiyam Al-Lail (The Night Prayer) and Voluntary Prayers During the Day
Nu' aim bin Ziyad Abu Talhah said: "I heard An-Nu' man bin Bashir on the minbar in Hims saying: "We prayed Qiyam with the Messenger of Allah (ﷺ) during Ramadan on the night of the twenty-third until one-third of the night had passed, then we prayed Qiyam with him on the night of the twenty-fifth until one-half of the night had passed, then we prayed Qiyam with him on the night of the twenty-seventh until we thought that we would miss Al-Falah- that is what they used to call suhur."
Sunan an-Nasa'i 1606