(26) باب مَا جَاءَ فِي الصَّائِمِ يَأْكُلُ أَوْ يَشْرَبُ نَاسِيًا
Abu Hurairah narrated that
the Messenger of Allah said:
"Whoever eats or drinks forgetfully, then he has not broken (the fast), for it was only a provision that Allah provided for him."
Reference: Jami` at-Tirmidhi 721
In-book reference: Book 8, Hadith 40
English translation: Vol. 2, Book 3, Hadith 721