Sayyiduna Abu Hurairah (may Allah be pleased with him) narrated from the Messenger of Allah (peace and blessings be upon him), he (peace be upon him) said: "When any of you eats or drinks forgetfully while fasting, he should not break his fast but complete it, for it is Allah who has fed him and given him drink."
Hadith Referenceمسند اسحاق بن راهويه / كتاب الصوم / 398
Hadith Takhrij«بخاري ، كتاب الصوم ، باب اذا كل او شرب ناسبا ، رقم : 1933 . مسلم ، كتاب الصيام ، باب من اكل ناسياً وشريه ، رقم : 1155 . سنن ترمذي ، رقم : 721 . سنن دارمي ، رقم : 1726 . طبراني اوسط ، رقم : 949»
Sayyiduna Abu Huraira (may Allah be pleased with him) narrated from the Noble Prophet (peace and blessings be upon him), he (peace be upon him) said: "Whoever eats or drinks forgetfully should complete his fast, for it is Allah who has fed him and given him drink."
Hadith Referenceمسند اسحاق بن راهويه / كتاب الصوم / 399