Abdul 'Aziz bin Muhammad al-Daruradi عبد العزيز بن محمد الدراوردي · The Book on Sacrifices

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."