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The sacrificial service in the Temple – referred to by the Sages simply as avoda, or “service” – is one of the foundations of the Torah and is considered one of the spiritual pillars upon which the world stands (see the Mishna in Massekhet Pirkei Avot 1:2). Even after the destruction of the Temple, when the laws of the sacrificial service became relevant only for Messianic times, the Sages continued to discuss these topics to the extent that we have an entire Order of Talmud – Seder Kodashim. Although we only have Gemara on Seder Kodashim in the Talmud Bavli, there is evidence from the works of the rishonim that there was Talmud Yerushalmi on it, as well, that was not preserved and appears to have been lost entirely.
Massekhet Zevaḥim offers a broad explication of the laws of sacrifices that are brought from live animals – that is, fowls and animals – while meal offerings have a tractate, Massekhet Menahot, devoted to those laws. The main topics discussed are the sacrifices themselves – how they are prepared, where they are brought, what would disqualify them – but not what animals are brought for each sacrifice. That topic is dealt with in other tractates, and not only in Seder Kodashim. For example, Yoma and Pesaḥim introduce the sacrifices of Yom Kippur and Pesaḥ; Nazir introduces the sacrifices brought by a Nazirite, etc. Our tractate also does not discuss the order of the sacrificial service in the Temple, neither on a daily basis (those laws appear in Massekhet Tamid) nor on holidays (those appear in tractates devoted to individual holidays).