Compiled by Imam Yahya ibn Sharaf al-Nawawi
وعن زيد بن ثابت رضي الله عنه قال: تسحرنا مع رسول الله صلى الله عليه وسلم ثم قمنا إلى الصلاة قيل كم كان بينهما؟ قال: خمسون آية ((متفق عليه))
We took Suhur (predawn meal) with the Messenger of Allah (ﷺ) and then we stood up for (Fajr) Salat (prayer). It was asked: "How long was the gap between the two?" He replied: "The time required for the recitation of fifty Ayat."[Al-Bukhari and Muslim].