Exodus 22:30 "Neither shall you eat any meat that is torn in the field"

An animal that is attacked and killed by another animal is called a "terefah".

If it suffered a serious wound, we are forbidden to eat from its meat, even though it continues to live and is then slaughtered properly.

The same idea applies to an animal which suffers other serious wounds. If they are likely to cause the animal's death, it is considered terefah and may not be eaten, even if it is slaughtered properly.

There are other instances where an animal may be considered terefah and this Negative Mitzvah also forbids eating from them.