Hadith 4380
´It was narrated from 'Ali bin Abi Talib, may Allah be please wityh him, that the messenger of Allah said:` "Do not sacrifice and animal with its ears slit from the front, and animal with its ears slit from the back, an animals with its ears slit lengthwise, and animal with a round hole in its ears, or an animal with one bad eye."
Hadith 4381
´'Ali said:` " The Messenger of Allah commanded us to examine the eyes and ears (of animals for sacrifice)."