That a man asked Ibn 'Umar about the Udhiyah, "Is it obligatory?" So he said: "The Messenger of Allah (ﷺ) performed the Udhiyah as did the Muslims." He repeated the question. So he said: "Do you understand ?" The Messenger of Allah (ﷺ) slaughtered as did the Muslims."
Jami` at-Tirmidhi Book 19, Hadith 17
← Previous Hadith "I asked Abu Abyub how the slaughtering was done during the time of the Messenger of Allah (ﷺ). He said: 'A man would sacrifice a sheep for himself and the people in his household. They would eat from it and feed others, until the people (later) would boast about it and it became as you see now."

Jami` at-Tirmidhi Book 19, Hadith 16 Next Hadith → "The Messenger of Allah (ﷺ) stayed in Al-Madinah for ten years performing the Udhiyah.

Jami` at-Tirmidhi Book 19, Hadith 18