Kodashim

This Seder (order, or division) of the Mishnah is known as Kodashim (“sacred things” or “sanctities”), because it deals with subjects connected with Temple service and ritual slaughter of animals (shehitah).

After dealing with laws, two mostly descriptive tractates were added, Tamid discussing the daily sacrifice and Middot which overviews the Temple in Jerusalem.

In the Babylonian Talmud the sequence of the treatises follows the general order except that Bekorot is before Hullin, and Ḳinnim is placed before Tamid and Middot.

[4] As part of the Mishnah, the first major composition of Jewish law and ethics based on the Oral Torah, Kodashim was compiled and edited between 200–220 CE by Judah ha-Nasi and his colleagues.

In the Babylonian Talmud, all the tractates have Gemara for all their chapters except for Tamid which has it only for three chapters and Middot and Kinnim which don't have any[2][3] Although the subject matter was no longer directly relevant to life in the Babylonian academies, the Gemara was motivated by the idea that the study of the laws of the Temple service is a substitute for the service itself.

However, in the modern Daf Yomi cycle and in the printed editions of the Babylonian Talmud, the Mishnah for the last two tractates are added at the end, to “complete” the order.