The Messenger of Allah ﷺ stood among us one day to deliver a sermon at a watering place called Khumm, located between Mecca and Medina. He praised Allah and extolled Him, then offered admonition and reminder, and said, "To proceed. Listen, people..." and the rest of the hadith follows.
قام رسول الله ﷺ يوما فينا خطيبا بماء يدعى خما بين مكة والمدينة فحمد الله وأثنى عليه، ووعظ وذكر، ثم قال: أما بعد، ألا أيها الناس… الحديث.