Sahih Muslim 1092
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
وَحَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ ، حَدَّثَنَا أَبُو أُسَامَةَ ، ح وَحَدَّثَنَا إِسْحَاقُ ، أَخْبَرَنَا عَبْدَةُ ، ح وَحَدَّثَنَا ابْنُ الْمُثَنَّى ، حَدَّثَنَا حَمَّادُ بْنُ مَسْعَدَةَ ، كُلُّهُمْ عَنْ عُبَيْدِ اللَّهِ ، بِالإِسْنَادَيْنِ كِلَيْهِمَا . نَحْوَ حَدِيثِ ابْنِ نُمَيْرٍ .
A hadith like this has been narrated on the authority of 'Ubaidullah on the two chains of transmitters.