"Whoever eats or drinks forgetfully, then he has not broken (the fast), for it was only a provision that Allah provided for him."  

قَالَ رَسُولُ اللَّهِ ﷺ مَنْ أَكَلَ أَوْ شَرِبَ نَاسِيًا فَلاَ يُفْطِرْ فَإِنَّمَا هُوَ رِزْقٌ رَزَقَهُ اللَّهُ  

(Another chain) with the same or similar (Hadith as no. 721).  

عَنِ النَّبِيِّ ﷺ مِثْلَهُ أَوْ نَحْوَهُ قَالَ وَفِي الْبَابِ عَنْ أَبِي سَعِيدٍ وَأُمِّ إِسْحَاقَ الْغَنَوِيَّةِ