Sahih Muslim 1094
Sahih Muslim · Book 13: The Book of Fasting · 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
وَحَدَّثَنَاهُ ابْنُ الْمُثَنَّى ، حَدَّثَنَا أَبُو دَاوُدَ ، أَخْبَرَنَا شُعْبَةُ ، أَخْبَرَنِي سَوَادَةُ بْنُ حَنْظَلَةَ، الْقُشَيْرِيُّ قَالَ سَمِعْتُ سَمُرَةَ بْنَ جُنْدَبٍ ، - رضى الله عنه - يَقُولُ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم . فَذَكَرَ هَذَا .
A hadith like this has been narrated on the authority of Samura b. Jundub.