Musannaf Ibn Abi Shayba 3:5319

Zayd ibn al-Hubab narrated to us, from Mu'awiyah ibn Salih, who said: Nu'aym ibn Ziyad Abu Talhah al-Anmari narrated to me, saying: I heard al-Nu'man ibn Bashir on the pulpit of Homs saying: We stood [in prayer] with the Messenger of Allah, may Allah bless him and grant him peace, on the night of the twenty-third until the first third of the night. And we stood with him on the night of the twenty-fifth until the middle of the night. And we stood on the night of the twenty-seventh until we thought that we would miss the *falah* (success/pre-dawn meal), and we used to call it the *suhur*.