صحيح مسلم
Sahih Muslim
كتاب الصيام
The Book of Fasting
باب بَيَانِ أَنَّ الدُّخُولَ فِي الصَّوْمِ يَحْصُلُ بِطُلُوعِ الْفَجْرِ وَأَنَّ لَهُ الأَكْلَ وَغَيْرَهُ حَتَّى يَطْلُعَ الْفَجْرُ وَبَيَانِ صِفَةِ الْفَجْرِ الَّذِي تَتَعَلَّقُ بِهِ الأَحْكَامُ مِنَ الدُّخُولِ فِي الصَّوْمِ وَدُخُولِ وَقْتِ صَلاَةِ الصُّبْحِ وَغَيْرِ ذَلِكَ:
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
Hadith 1094
This hadith is listed as number 2545 in Maktaba Shamila
وحَدَّثَنَا زُهَيْرُ بْنُ حَرْبٍ ، حَدَّثَنَا إِسْمَاعِيلُ ابْنُ عُلَيَّةَ ، حَدَّثَنِي عَبْدُ اللَّهِ بْنُ سَوَادَةَ ، عَنْ أَبِيهِ ، عَنْ سَمُرَةَ بْنِ جُنْدُبٍ رَضِيَ اللَّهُ عَنْهُ ، قَالَ : قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ : " لَا يَغُرَّنَّكُمْ أَذَانُ بِلَالٍ ، وَلَا هَذَا الْبَيَاضُ لِعَمُودِ ، الصُّبْحِ حَتَّى يَسْتَطِيرَ هَكَذَا " .
ahadeeth bin Jundub reported Allah's Messenger (ﷺ) as saying: The Adhan of Bilal (RA) should not mislead you nor the whiteness (of the pillar) of dawn, for it is not the whiteness of the true dawn, but that of the false dawn which is vertical like a pillar and you can eat food till the streaks of whiteness spread like it.
