(9) باب فِي الضَّحِيَّةِ بِعَضْبَاءِ الْقَرْنِ وَالأُذُنِ
Narrated 'Ali:
"The Messenger of Allah (ﷺ) prohibited that an animal with a A'dab (stump) horn or ear should be slaughtered as a sacrifice." Qatadah (one of the narrators) said: "So I mentioned this to Sa'eed bin Al-Musayyab and he said: 'The A'dab is that which equals or more than that.'"
Reference: Jami` at-Tirmidhi 1504
In-book reference: Book 19, Hadith 15
English translation: Vol. 3, Book 17, Hadith 1504