I asked al-Bara' ibn Azib: What should be avoided in sacrificial animals? He said: The Messenger of Allah (ﷺ) stood among us, and my fingers are smaller than his fingers, and my fingertips are smaller than his fingertips. He said (pointing with his fingers): Four (types of animals) should be avoided in sacrifice: A One-eyed animal which has obviously lost the sight of one eye, a sick animal which is obviously sick, a lame animal which obviously limps and an animal with a broken leg with no marrow. I also detest an animal which has defective teeth. He said: Leave what you detest, but do not make it illegal for anyone.

Abu Dawud said: (By a lean animal mean) and animal which has no marrow.