ENOfficial
This hadith has been narrated by Ibn 'Uyaina on the authority of al-Zuhri with the same chain of transmitters and he reported: The Messenger of Allah (ﷺ) was leading prayer at 'Arafa.
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا يَحْيَى بْنُ يَحْيَى، وَعَمْرٌو النَّاقِدُ، وَإِسْحَاقُ بْنُ إِبْرَاهِيمَ، عَنِ ابْنِ عُيَيْنَةَ، عَنِ الزُّهْرِيِّ، بِهَذَا الإِسْنَادِ قَالَ وَالنَّبِيُّ صلى الله عليه وسلم يُصَلِّي بِعَرَفَةَ .
sunnah.com