صحیح مسلم

روزے کاآغاز طلوع فجر سے ہوتا ہے اور فجر طلوع ہونے تک اس (روزہ دار )کے لیے کھانا وغیرہ جائز ہے

Chapter: Clarifying that fasting begins at dawn, and a person may eat and other than that until dawn begins; And clarifying the dawn which has to do with the rulings concerning the beginning of fasting and the beginning of the time for the Subh Prayer, and other than that, which is the Second Dawn, which is called the True Dawn. The First Dawn, which is the False Dawn, has nothing to do with the rulings