Yahya bin Abi Kathir يحيى بن أبي كثير الطائي · The Book of ad-Dahaya (Sacrifices)

"I heard the Messenger of Allah say" - and he gestured with his fingers, but his fingers were shorter than the fingers of the Messenger of Allah - he said "It is not permissible to offer as a sacrifice an animal that clearly has one bad eye, a lame animal that is obviously lame, as sick animal that is obviously sick, or an animals that is so emaciated that it is as if there is no marrow in its bones."