(27) باب وَقْتِ الْفَجْرِ
Narrated Qatada:
Anas bin Malik said, "The Prophet (ﷺ) and Zaid bin Thabit took the 'Suhur' together and after finishing the meal, the Prophet (ﷺ) stood up and prayed (Fajr prayer)." I asked Anas, "How long was the interval between finishing their 'Suhur' and starting the prayer?" He replied, "The interval between the two was just sufficient to recite fifty 'Ayat." (Verses of the Qur'an).
Reference: Sahih al-Bukhari 576
In-book reference: Book 9, Hadith 52
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 1, Book 10, Hadith 550