صحيح البخاري Sahih Bukhari كتاب التهجد The Book of Salat-Ut-Tahajjud (Night Prayer)
بَابُ مَنْ تَسَحَّرَ فَلَمْ يَنَمْ حَتَّى صَلَّى الصُّبْحَ:

(8) Chapter. Whoever took the Suhur (the meal taken before dawn in the month of Ramadan) and did not sleep before offering Fajr prayers.

1 hadith
Hadith 1134
حَدَّثَنَا يَعْقُوبُ بْنُ إِبْرَاهِيمَ , قَالَ : حَدَّثَنَا رَوْحٌ , قَالَ : حَدَّثَنَا سَعِيدٌ ، عَنْ قَتَادَةَ ، عَنْ أَنَسِ بْنِ مَالِكٍ رَضِيَ اللَّهُ عَنْهُ ، " أَنَّ نَبِيَّ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ وَزَيْدَ بْنَ ثَابِتٍ رَضِيَ اللَّهُ عَنْهُ تَسَحَّرَا ، فَلَمَّا فَرَغَا مِنْ سَحُورِهِمَا قَامَ نَبِيُّ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ إِلَى الصَّلَاةِ فَصَلَّى ، فَقُلْنَا لِأَنَسٍ : كَمْ كَانَ بَيْنَ فَرَاغِهِمَا مِنْ سَحُورِهِمَا وَدُخُولِهِمَا فِي الصَّلَاةِ ؟ , قَالَ : كَقَدْرِ مَا يَقْرَأُ الرَّجُلُ خَمْسِينَ آيَةً " .
Narrated Qatada: Anas bin Malik said, "The Prophet (p.b.u.h) and Zaid bin Thabit took their Suhur together. When they finished it, the Prophet stood for the (Fajr) prayer and offered it." We asked Anas, "What was the interval between their finishing the Suhur and the starting of the morning prayer?" Anas replied, "It was equal to the time taken by a person in reciting fifty verses of the Qur'an."
Hadith Reference Sahih Bukhari / The Book of Salat-Ut-Tahajjud (Night Prayer) / Hadith: 1134
Hadith Grading محدثین: أحاديث صحيح البخاريّ كلّها صحيحة