Mishkat al-Masabih 7 Fasting كتاب الصوم 27

وَعَنْ عَمْرِو بْنِ الْعَاصِ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «فَصْلُ مَا بَيْنَ صِيَامِنَا وَصِيَامِ أَهْلِ الْكِتَابِ أَكْلَةُ السَّحَرِ» . رَوَاهُ مُسلم

‘Amr b. al-‘As reported God’s messenger as saying, “The difference between our fasting and that of the People of the Book is eating shortly before dawn.” Muslim transmitted it.