For the source text click/tap here: Zevachim 109
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The Mishnayot on our daf discuss different types of Temple services for which those who perform them outside of the Beit HaMikdash will be held liable.
The first Mishna on the page concludes with a ruling that if a ka-zayit – an olive size piece of the sacrifice – is brought outside the Temple, that would be sufficient to be considered a sacrifice that took place outside, with all of the associated repercussions.
In the second Mishna on the page we learn that other types of Temple services also cannot be performed outside of the Beit HaMikdash. Therefore, if a ka-zayit from one of the various types of meal-offerings were sacrificed outside of the Temple, the individual who performed the service would be held liable. In this case, however Rabbi Eliezer rules that a ka-zayit would not be enough, and only if the entire meal offering were brought outside would the service be considered to be significant.