I never saw the Prophet ﷺ offering any prayer not at its stated time except two; he prayed the Maghrib and the ʿIsha' together and he offered the morning prayer before its usual time.  

مَا رَأَيْتُ النَّبِيَّ ﷺ صَلَّى صَلاَةً بِغَيْرِ مِيقَاتِهَا إِلاَّ صَلاَتَيْنِ جَمَعَ بَيْنَ الْمَغْرِبِ وَالْعِشَاءِ وَصَلَّى الْفَجْرَ قَبْلَ مِيقَاتِهَا  

I have never seen Messenger of Allah, ﷺ but observing the prayers at their appointed times except two prayers, sunset and 'Isha, ' at Muzdalifa (where he deferred the sunset prayer to combine it with 'Isha' and he observed the dawn prayer before its stipulated time on that day (10th of Dhu'l-Hijja).  

مَا رَأَيْتُ رَسُولَ اللَّهِ ﷺ صَلَّى صَلاَةً إِلاَّ لِمِيقَاتِهَا إِلاَّ صَلاَتَيْنِ صَلاَةَ الْمَغْرِبِ وَالْعِشَاءِ بِجَمْعٍ وَصَلَّى الْفَجْرَ يَوْمَئِذٍ قَبْلَ مِيقَاتِهَا  

"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. (Using translation from Nasāʾī 3038)   

مَا رَأَيْتُ رَسُولَ اللهِ ﷺ صَلَّى صَلَاةً قَطُّ إِلَّا لِمِيقَاتِهَا إِلَّا صَلَاتَيْنِ صَلَاةَ الْمَغْرِبِ وَصَلَاةَ الْعِشَاءِ بِجَمْعٍ وَصَلَّى الْفَجْرَ يَوْمَئِذٍ قَبْلَ مِيقَاتِهَا وقَالَ ابْنُ نُمَيْرٍ الْعِشَاءَيْنِ فَإِنَّهُ صَلَّاهُمَا بِجَمْعٍ جَمِيعًا  

"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. (Using translation from Nasāʾī 3038)   

عَبْدُ اللهِ مَا رَأَيْتُ رَسُولَ اللهِ ﷺ صَلَّى صَلَاةً إِلَّا لِمِيقَاتِهَا إِلَّا صَلَاتَيْنِ صَلَاةَ الْمَغْرِبِ وَالْعِشَاءِ بِجَمْعٍ وَصَلَاةَ الْفَجْرِ يَوْمَئِذٍ قَبْلَ مِيقَاتِهَا  

Ibn Mas’ud said “ I never saw the Apostle of Allaah ﷺ observe a prayer out of its proper time except(two prayers) at Al Muzdalifah. He combined the sunset and night prayers at Al Muzdalifah and he offered the dawn prayer that day before its proper time. (Using translation from Abū Dāʾūd 1934)   

مَا رَأَيْتُ رَسُولَ اللهِ ﷺ صَلَّى صَلَاةً إِلَّا لِمِيقَاتِهَا إِلَّا أَنَّهُ جَمَعَ بَيْنَ الْمَغْرِبِ وَالْعِشَاءِ بِجَمْعٍ وَصَلَّى الصُّبْحَ يَوْمَئِذٍ لِغَيْرِ مِيقَاتِهَا  

"عَنِ ابْن مَسْعُودٍ قَالَ: مَا رَأَيْتُ النَّبِىَّ ﷺ صَلَّى صَلَاةً قَطُّ إلَّا لوقْتِهَا إِلَّا أنَّه جَمَعَ بَيْنَ الظُّهْرِ وَالْعَصْرِ بعَرَفَة، وَالْمَغْرِب وَالْعِشَاءِ: بجَمْعٍ، وَصَلَّى الْفَجْر يَوْمَئذٍ قَبْلَ وَقْتهَا".  

"عَنِ ابْنِ مَسْعُودٍ قَالَ: مَا رَأَيْتُ رَسُولَ اللهِ ﷺ صَلَّى صَلاةً قَطُّ إِلا لوقْتِهَا إِلا صَلاتيْنِ جَمَعَ بَيْنَ الْمَغْرِبِ وَالْعِشَاءِ بِجَمْعٍ".