The Messenger of Allah ﷺ as saying: The difference between our fasting and that of the people of the Book is eating shortly before dawn.  

قَالَ رَسُولُ اللَّهِ ﷺ إِنَّ فَصْلَ مَا بَيْنَ صِيَامِنَا وَصِيَامِ أَهْلِ الْكِتَابِ أَكْلَةُ السَّحَرِ