(9) باب الْمُدَابَرَةِ وَهِيَ مَا قُطِعَ مِنْ مُؤَخَّرِ أُذُنِهَا
It was narrated that 'Ali said:
"The Messenger of Allah commanded us to examine the eyes and ears (of animals) and not to Sacrifice and animal with a bad eye, nor an animal with its ears slit from the front, nor an animals with its ears slit form the back, nor an animal with a round hole in its ear.
Reference: Sunan an-Nasa'i 4373
In-book reference: Book 43, Hadith 13
English translation: Vol. 5, Book 43, Hadith 4378