"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 صَلَاةَ الْمَغْرِبِ وَالْعِشَاءِ صَلَّاهُمَا بِجَمْعٍ وَصَلَّى الْفَجْرَ يَوْمَئِذٍ قَبْلَ مِيقَاتِهَا»  

[Machine] "He obliged him, so I accompanied him, and we reached Muzdalifah. When dawn broke, he said, 'Get up.' I said, 'O Abu Abdur Rahman, I have never seen you praying at this hour before.' He said, 'The Messenger of Allah ﷺ used to do that.' Zuhair (bin Khuzaimah) said, 'It was not (mentioned) in the Book of Allah that he used to pray at this hour except these two prayers in this place from this day.' Abdullah said, 'These are two prayers that are delayed from their time; the Maghrib prayer after the people come to Muzdalifah, and the Fajr prayer when dawn breaks. I have seen the Messenger of Allah ﷺ doing that.'"  

أَنْ أَلْزَمَهُ فَلَزِمْتُهُ فَأَتَيْنَا الْمُزْدَلِفَةَ فَلَمَّا كَانَ حِينَ طَلَعَ الْفَجْرَ قَالَ قُمْ قُلْتُ يَا أَبَا عَبْدِ الرَّحْمَنِ إِنَّ هَذِهِ السَّاعَةَ مَا رَأَيْتُكَ صَلَّيْتَ فِيهَا قَطُّ قَالَ إِنَّ رَسُولَ اللهِ ﷺ يَفْعَلُ ذَلِكَ قَالَ زُهَيْرٌ وَلَمْ يَكُنْ فِي كِتَابِ اللهِ كَانَ لَا يُصَلِّي هَذِهِ السَّاعَةَ إِلَّا هَذِهِ الصَّلَاةَ فِي هَذَا الْمَكَانِ مِنْ هَذَا الْيَوْمِ قَالَ عَبْدُ اللهِ «هُمَا صَلَاتَانِ تُؤَخَّرَانِ عَنْ وَقْتِهِمَا صَلَاةُ الْمَغْرِبِ بَعْدَمَا يَأْتِي النَّاسُ الْمُزْدَلِفَةَ وَصَلَاةُ الْغَدَاةِ حِينَ يَبْزُغُ الْفَجْرُ فَإِنِّي رَأَيْتُ رَسُولَ اللهِ ﷺ يَفْعَلُ ذَلِكَ»