Leviticus 7:16-18
New Revised Standard Version Catholic Edition
16 But if the sacrifice you offer is a votive offering or a freewill offering, it shall be eaten on the day that you offer your sacrifice, and what is left of it shall be eaten the next day; 17 but what is left of the flesh of the sacrifice shall be burned up on the third day. 18 If any of the flesh of your sacrifice of well-being is eaten on the third day, it shall not be acceptable, nor shall it be credited to the one who offers it; it shall be an abomination, and the one who eats of it shall incur guilt.
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