Narrated Abu Huraira: The Prophet said, "If somebody eats or drinks forgetfully then he should complete his fast, for what he has eaten or drunk, has been given to him by Allah."
Hadith ReferenceSahih Bukhari / The Book of As-Saum (The Fasting). / Hadith: 1933
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة