"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."
Sunan an-Nasa'i Book 43, Hadith 17
← Previous Hadith " The Messenger of Allah commanded us to examine the eyes and ears (of animals for sacrifice)."

Sunan an-Nasa'i Book 43, Hadith 16 Next Hadith → "The Messenger of Allah said: 'Do not slaughter anything but a Musinnah, unless that is difficult, in which case you can slaughter a Jadh'ah sheep."'

Sunan an-Nasa'i Book 43, Hadith 18