كتاب الصلاة
2  
The Book of Prayer
Narrated Ibn 'Abbas (RA):
Allah's Messenger (ﷺ) said that, "Dawn is of two types; the dawn in which eating is forbidden (for the fasting person) and prayer is permitted and the dawn in which prayer is forbidden i.e. the morning prayer and eating is permitted." [Reported by Ibn Khuzaimah and al-Hakim who (both) graded it Sahih].
وَعَنْ اِبْنِ عَبَّاسٍ رَضِيَ اَللَّهُ عَنْهُمَا قَالَ: قَالَ رَسُولُ اَللَّهِ ‏- صلى الله عليه وسلم ‏-{ اَلْفَجْرُ فَجْرَانِ: فَجْرٌ يُحَرِّمُ اَلطَّعَامَ وَتَحِلُّ فِيهِ اَلصَّلَاةُ, وَفَجْرٌ تَحْرُمُ فِيهِ اَلصَّلَاةُ ‏- أَيْ: صَلَاةُ اَلصُّبْحِ ‏- وَيَحِلَّ فِيهِ اَلطَّعَامُ } رَوَاهُ اِبْنُ خُزَيْمَةَ, وَالْحَاكِمُ, وَصَحَّحَاهُ 1‏ .‏


‏1 ‏- صحيح.‏ رواه ابن خزيمة (356)‏، وعنه الحاكم (191)‏، ويشهد له ما بعده.‏

Sunnah.com reference : Book 2, Hadith 21
Arabic/English book reference : Book 2, Hadith 169