Leviticus 7:20

17 But if any of the flesh of the offering is still unused on the third day, it is to be burned with fire.

18 And if any of the flesh of the peace-offering is taken as food on the third day, it will not be pleasing to God and will not be put to the account of him who gives it; it will be unclean and a cause of sin to him who takes it as food.

19 And flesh touched by any unclean thing may not be taken for food: it is to be burned with fire; and as for the flesh of the peace-offerings, everyone who is clean may take it as food:

20 But he who is unclean when he takes as food the flesh of the peace-offerings, which are the Lord's, will be cut off from his people.

21 And anyone who, after touching any unclean thing of man or an unclean beast or any unclean and disgusting thing, takes as food the flesh of the peace-offerings, which are the Lord's, will be cut off from his people.

22 And the Lord said to Moses,

23 Say to the children of Israel: You are not to take any fat, of ox or sheep or goat, for food.