(12) باب الْعَضْبَاءِ
'Ali said:
"Messenger of Allah forbade us from sacrificing an animal with a broken horn." I (the narrator) mentioned that to Sa'eed bin Al_Musayyab and he said: "Yes, m unless half or more of the horn is missing."
Reference: Sunan an-Nasa'i 4377
In-book reference: Book 43, Hadith 17
English translation: Vol. 5, Book 43, Hadith 4382