كتاب الصيام
13  
The Book of Fasting
(8)
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
(8)
بَاب بَيَانِ أَنَّ الدُّخُولَ فِي الصَّوْمِ يَحْصُلُ بِطُلُوعِ الْفَجْرِ وَأَنَّ لَهُ الْأَكْلَ وَغَيْرَهُ حَتَّى يَطْلُعَ الْفَجْرُ وَبَيَانِ صِفَةِ الْفَجْرِ الَّذِي تَتَعَلَّقُ بِهِ الْأَحْكَامُ مِنْ الدُّخُولِ فِي الصَّوْمِ وَدُخُولِ وَقْتِ صَلَاةِ الصُّبْحِ وَغَيْرِ ذَلِكَ
Sahih Muslim 1092 e

A hadith like this has been narrated on the authority of 'Ubaidullah on the two chains of transmitters.

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 ‏.‏
Reference : Sahih Muslim 1092e
In-book reference : Book 13, Hadith 46
USC-MSA web (English) reference : Book 6, Hadith 2403
  (deprecated numbering scheme)