The crack in the diamond[1]
ואם האכל יאכל ביום השלישי פגול הוא לא ירצה
If he shall surely eat it on the third day, it is pigul, and it will not be desired[2]
The Torah prohibits something known as pigul. When the Kohen is slaughtering an offering, even if he does the procedure correctly, he can invalidate it. How so? He has to have the correct intent when slaughtering the animal. If he simply thinks in his mind[3] that this offering is going to be eaten outside the Temple, when in fact it is only permissible to eat it in the Temple, he has invalidated the offering. Alternatively, if he thinks that this offering is going to be eaten in a few days, when in fact every offering has a short time period when its consumption is permitted, he has invalidated the offering. These thoughts create a status on the offering known as pigul. Not only does the offering become invalid, but if someone were to eat it, they would incur kares, spiritual excision[4]. We see that pigul is a very grave sin.