"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 : Book 43, Hadith 17 English translation : Vol. 5, Book 43, Hadith 4382
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