صحيح ابن خزيمه
Sahih Ibn Khuzaymah
كتاب: الصلاةBook of Prayer
(30) بَابُ ذِكْرِ بَيَانِ الْفَجْرِ الَّذِي يَجُوزُ صَلَاةُ الصُّبْحِ بَعْدَ طُلُوعِهِ،Chapter 30: Clarification of the dawn after which Fajr prayer is valid
Hadith Q356
إِذِ الْفَجْرُ هُنَا فَجْرَانِ، طُلُوعُ أَحَدِهِمَا بِاللَّيْلِ، وَطُلُوعُ الثَّانِي يَكُونُ بِطُلُوعِ النَّهَارِ.
Because there are two types of Fajr: one Fajr rises during the night, and the other rises with the coming of the day.
