The meat that was left until the third day was considered as tainted (piggûl). In Hebrew, the term is derived from a verb that means “to rot.” It may reflect the fact that by the third day, the meat will have become rancid and spoiled (see Leviticus 19:7; Isaiah 65:4; Ezekiel 4:14).
18 Dans le cas où l'on mangerait de la chair de son sacrifice d'actions de grâces le troisième jour, le sacrifice ne sera point agréé; il n'en sera pas tenu compte à celui qui l'a offert; ce sera une chose infecte, et quiconque en mangera restera chargé de sa faute.