Hadith 4:62
Waki’ narrated to us, from Hisham, from Qatadah, from Anas, from Zayd ibn Thabit, who said: We ate the pre-dawn meal (suhur) with the Messenger of Allah (may Allah bless him and grant him peace), then we stood up for the prayer. We said: "How much was between them?" He said: "The recitation of fifty verses."
حدثنا وكيع عن هشام عن قتادة عن أنس عن زيد بن ثابت قال تسحرنا مع رسول الله صلى الله عليه وسلم ثم قمنا إلى الصلاة قلنا كم كان بينهما قال قراءة خمسين آية