HILCHOT METAMEI MISHKAV UMOSHAV
The Laws of the Persons Who Impart Impurity to the Places Where They Lie and Sit
Included in this text are four positive commandments. They comprise the following:
1) the laws of the impurity of a woman in her menstrual state;
2) the laws of the impurity of a woman who gave birth;
3) the laws of the impurity of a zavah;
4) the laws of the impurity of a zav.
These mitzvot are explained in the ensuing chapters.