Ishaq bin Ibrahim bin Muhammad إسحاق بن إبراهيم بن محمد · The Book of ad-Dahaya (Sacrifices)

"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."

"I heard two things from the Messenger of Allah He said 'Allah, the Mighty and Sublime, ahs decreed proficiency in all things, so when you kill, kill well, and when you slaughter, slaughter well. Let one of you sharpen his blade and spear suffering to the animal he slaughter."" (Sahih )

the Messenger of Allah forbade eating the meat of the sacrificial animals after three days then he said: "Eat, take some with you (if traveling). And store some." ( Sahih)