حَدَّثَنَا عَمْرُو بْنُ عَاصِمٍ، قَالَ حَدَّثَنَا هَمَّامٌ، عَنْ قَتَادَةَ، عَنْ أَنَسٍ، أَنَّ زَيْدَ بْنَ ثَابِتٍ، حَدَّثَهُ أَنَّهُمْ، تَسَحَّرُوا مَعَ النَّبِيِّ صلى الله عليه وسلم ثُمَّ قَامُوا إِلَى الصَّلاَةِ‏.‏ قُلْتُ كَمْ بَيْنَهُمَا قَالَ قَدْرُ خَمْسِينَ أَوْ سِتِّينَ ـ يَعْنِي آيَةً ـ ح‏.‏
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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).