Abu Huraira reported God’s messenger as saying, “If anyone forgets when he is fasting and eats or drinks he should complete his fast, for it is only God who has fed him and given him drink.” (Bukhari and Muslim.)
Hadith Referenceمشكوة المصابيح / كتاب الصوم / 2003
Hadith Gradingالألبانی:مُتَّفَقٌ عَلَيْهِ | زبیر علی زئی:متفق عليه
Hadith Takhrij´تحقيق و تخريج: محدث العصر حافظ زبير على زئي رحمه الله` «متفق عليه، رواه البخاري (1933) و مسلم (171 /1155)»