Sunan an-Nasa'i 606
سنن النسائي#606Sahihأَخْبَرَنَا يَعْقُوبُ بْنُ إِبْرَاهِيمَ، قَالَ حَدَّثَنَا هُشَيْمٌ، عَنْ إِسْمَاعِيلَ بْنِ أَبِي خَالِدٍ، قَالَ حَدَّثَنَا أَبُو إِسْحَاقَ، عَنْ سَعِيدِ بْنِ جُبَيْرٍ، قَالَ كُنْتُ مَعَ ابْنِ عُمَرَ حَيْثُ أَفَاضَ مِنْ عَرَفَاتٍ فَلَمَّا أَتَى جَمْعًا جَمَعَ بَيْنَ الْمَغْرِبِ وَالْعِشَاءِ فَلَمَّا فَرَغَ قَالَ فَعَلَ رَسُولُ اللَّهِ صلى الله عليه وسلم فِي هَذَا الْمَكَانِ مِثْلَ هَذَا .
It was narrated that Sa'eed bin Jubair said:"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
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
In-book reference: 6:113