For the source text click/tap here: Zevachim 91
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Rabbi Zeira said that we learn this halakha in the mishna as well: Rabbi Shimon said: If you saw oil that is being distributed in the Temple courtyard, you do not need to ask what it is; rather, it is left over from the oil of the wafers of the meal offerings of Israelites, or it is left over from the log of oil of a leper, as one does not contribute oil as a gift offering. Rabbi Zeira learns by inference from the mishna that according to the one who says that one may contribute oil, it is distributed to the priests for consumption and it is not sacrificed entirely.