It was narrated from 'Abdullah bin Yazid that Abu Ayyub Al-Ansari told him, that during the Farewell Pilgrimage. He prayed with the Messenger of Allah ﷺ Maghrib and 'Isha' prayers together at Al-Muzdalifah. (Using translation from Nasāʾī 605)  

أَخْبَرَهُ أَنَّهُ «صَلَّى مَعَ رَسُولِ اللهِ ﷺ فِي حَجَّةِ الْوَدَاعِ الْمَغْرِبَ وَالْعِشَاءَ بِالْمُزْدَلِفَةِ جَمِيعًا»  

"I was with Ibn 'Umar when he departed from 'Arafah. When he came to Jam' (Al-Muzdalifah), he combined Maghrib and 'Isha', and when he finished he said: 'The Messenger of Allah ﷺ did similar to this in this place.'" (Using translation from Nasāʾī 606)   

«فَعَلَ رَسُولُ اللهِ ﷺ فِي هَذَا الْمَكَانِ مِثْلَ مَا فَعَلْتُ»  

"I never saw the Messenger of Allah ﷺ combine any two prayers except in Al-Muzdalifah, and on that day he prayed Subh before its time." (Using translation from Nasāʾī 608)  

«مَا رَأَيْتُ النَّبِيَّ ﷺ جَمَعَ بَيْنَ صَلَاتَيْنِ إِلَّا بِجَمْعٍ وَصَلَّى الصُّبْحَ يَوْمَئِذٍ قَبْلَ وَقْتِهَا»