Bulugh al-Maram 5 Fasting كتاب الصيام 20

وَعَنْ أَبِي هُرَيْرَةَ – رضى الله عنه – قَالَ: قَالَ رَسُولُ اَللَّهِ – صلى الله عليه وسلم -{ مَنْ نَسِيَ وَهُوَ صَائِمٌ, فَأَكَلَ أَوْ شَرِبَ, فَلْيُتِمَّ صَوْمَهُ, فَإِنَّمَا أَطْعَمَهُ اَللَّهُ وَسَقَاهُ } مُتَّفَقٌ عَلَيْهِ 1 . 1 – صحيح. رواه البخاري ( 1933 )، ومسلم ( 1155 )، واللفظ لمسلم.

Abu Hurairah (RAA) narrated that The Messenger of Allah (صلى الله عليه وسلم) said: ‘Whoever forgets that he is fasting, and eats or drinks is to complete his fast, as it was Allah who fed him and gave him something to drink.” Agreed upon.