I witnessed the Messenger of Allah ﷺ addressing the people during the Farewell Pilgrimage. He asked, "What day is this day of yours?" And he proceeded to mention his sermon on the Day of Sacrifice.
حدثنا يحيى بن آدم حدثنا أبو الأحوص عن شبيب بن غرقدة البارقي
شهدت رسول الله ﷺ يخطب الناس في حجة الوداع فقال أي يوم يومكم فذكر خطبته يوم النحر
Its isnad is sahih. Yahya bin Adam is trustworthy, and Abu Ahwas is Salam bin Salim Hanafi Madani, who is trustworthy and precise, Shabib bin Gharqada Bariqi is also trustworthy, and Sulayman bin Amr bin Ahwas is deemed trustworthy and his hadith has been accepted. The hadith has already appeared at 14302.