أَخْبَرَنَا قُتَيْبَةُ، قَالَ حَدَّثَنَا اللَّيْثُ، عَنْ مُوسَى بْنِ عُلَىٍّ، عَنْ أَبِيهِ، عَنْ أَبِي قَيْسٍ، عَنْ عَمْرِو بْنِ الْعَاصِ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ إِنَّ فَصْلَ مَا بَيْنَ صِيَامِنَا وَصِيَامِ أَهْلِ الْكِتَابِ أَكْلَةُ السُّحُورِ ‏"‏ ‏.‏

It was narrated that 'Amr bin Al-As said: "The Messenger of Allah said: 'The difference between our fasting and the fasting of the people of the Book, is eating Sahur."' ' Translation Not Available

Book Ref: Sunan An Nisai Book 22 Hadith 2166
Web Ref:  Sunan An Nisai Vol 3 Book 22 Hadith 2168