Moed Katan מועד קטן

The "minor festival" is chol ha-moed, the days between the first and last days of Passover and Sukkot. Work is not done on them, but not every kind of work is forbidden: the tractate weighs what may be done to prevent a loss that cannot be recovered, and what waits until the festival ends.

The third chapter begins with shaving and cutting hair during chol ha-moed—and by way of the excommunicated and the mourner passes to mourning as a whole: the seven days, the thirty days, the rending of the garment, the consoling. So it happens that the laws of mourning, which have no tractate of their own, are gathered precisely here.

Order: Moed. There is Gemara in both the Babylonian and the Jerusalem Talmud.