Ezekiel 44:28 (KJV)

And they shall teach my people the difference between the holy and profane, and cause them to discern between the unclean and the clean.

And in controversy they shall stand in judgment; and they shall judge it according to my judgments: and they shall keep my laws and my statutes in all mine assemblies; and they shall hallow my sabbaths.

And they shall come at no dead person to defile themselves: but for father, or for mother, or for son, or for daughter, for brother, or for sister that hath had no husband, they may defile themselves.

And after he is cleansed, they shall reckon unto him seven days.

And in the day that he goeth into the sanctuary, unto the inner court, to minister in the sanctuary, he shall offer his sin offering, saith the Lord GOD.

They shall eat the meat offering, and the sin offering, and the trespass offering: and every dedicated thing in Israel shall be theirs.

And the first of all the firstfruits of all things, and every oblation of all, of every sort of your oblations, shall be the priest's: ye shall also give unto the priest the first of your dough, that he may cause the blessing to rest in thine house.

The priests shall not eat of any thing that is dead of itself, or torn, whether it be fowl or beast.