For the source text click/tap here: Zevachim 42
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We have learned that inappropriate thoughts – specifically thoughts relating to eating the korban in the wrong place or at the wrong time – can potentially ruin the sacrifice and make it invalid. Furthermore, thoughts related to the wrong time will cause the korban to become piggul – abhorrent – and someone who eats of that sacrifice will be liable to receive the punishment of karet – a Heavenly death sentence (see above, daf 27).
The new Mishna on our daf lists a number of things connected with sacrifices that cannot become piggul even if the person bringing the korban planned to eat them after the appropriate time.