It was narrated that ‘Ali said: “The Messenger of Allah صلی اللہ علیہ وآلہ وسلم commanded us to examine the eyes and ears (of animals) and not to sacrifice an animal with a bad eye, nor an animal with its ears slit from the front, nor an animal with its ears slit from the back, nor an animal with its ears slit lengthwise, nor an animal with a round hole in its ear. (Hasan)