"I never saw the Messenger of Allah offer any prayer except at the proper time, apart from Maghrib and Isha in Jam (Al-Muzdalifah) and Fajir on that day, which he offered before the usual time.  

مَا رَأَيْتُ رَسُولَ اللَّهِ ﷺ صَلَّى صَلاَةً قَطُّ إِلاَّ لِمِيقَاتِهَا إِلاَّ صَلاَةَ الْمَغْرِبِ وَالْعِشَاءِ صَلاَّهُمَا بِجَمْعٍ وَصَلاَةَ الْفَجْرِ يَوْمَئِذٍ قَبْلَ مِيقَاتِهَا