(15) بَابُ إِذَا حَنِثَ نَاسِيًا فِي الأَيْمَانِ
Narrated Abu Huraira:
The Prophet (ﷺ) said, "If somebody eats something forgetfully while he is fasting, then he should complete his fast, for Allah has made him eat and drink."
Reference: Sahih al-Bukhari 6669
In-book reference: Book 83, Hadith 47
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 8, Book 78, Hadith 662