Sunan Abi Dawud 1956
سنن أبي داود#1956Sahihحَدَّثَنَا عَبْدُ الْوَهَّابِ بْنُ عَبْدِ الرَّحِيمِ الدِّمَشْقِيُّ، حَدَّثَنَا مَرْوَانُ، عَنْ هِلاَلِ بْنِ عَامِرٍ الْمُزَنِيِّ، حَدَّثَنِي رَافِعُ بْنُ عَمْرٍو الْمُزَنِيُّ، قَالَ رَأَيْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَخْطُبُ النَّاسَ بِمِنًى حِينَ ارْتَفَعَ الضُّحَى عَلَى بَغْلَةٍ شَهْبَاءَ وَعَلِيٌّ - رضى الله عنه - يُعَبِّرُ عَنْهُ وَالنَّاسُ بَيْنَ قَاعِدٍ وَقَائِمٍ .
Narrated Rafi' ibn Amr al-Muzani: I saw the Messenger of Allah (ﷺ) addressing the people at Mina (on the day of sacrifice) when the sun rose high (i.e. in the forenoon) on a white mule, and Ali (Allah be pleased with him) was interpreting on his behalf; some people were standing and some sitting
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: 11:236