"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."  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ لاَ يُضَحَّى بِمُقَابَلَةٍ وَلاَ مُدَابَرَةٍ وَلاَ شَرْقَاءَ وَلاَ خَرْقَاءَ وَلاَ عَوْرَاءَ  

" The Messenger of Allah commanded us to examine the eyes and ears (of animals for sacrifice)."  

سَمِعْتُ عَلِيًّا يَقُولُ أَمَرَنَا رَسُولُ اللَّهِ ﷺ أَنْ نَسْتَشْرِفَ الْعَيْنَ وَالأُذُنَ