(99) باب مَنْ يُصَلِّي الْفَجْرَ بِجَمْعٍ
Narrated `Abdullah:
I never saw the Prophet (ﷺ) offering any prayer not at its stated time except two; he prayed the Maghrib and the `Isha' together and he offered the morning prayer before its usual time. (ID)
Reference (ID): Sahih al-Bukhari 1682 (ID)
In-book reference (ID): Book 25, Hadith 162 (ID)
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 2, Book 26, Hadith 742 (ID)