Tejarot ( Heb. טהרות - pure ) is the last of the six sections of the Mishnah . It consists of 12 treatises combining the laws of the Oral Torah , devoted to the numerous laws of ritual purity and impurity. These laws are associated with being in the Temple and the special commandments of the koens . Both in the Babylonian Talmud and in Jerusalem there is only a single treatise from the section of Teharoth, namely the treatise of Nida , whose laws are relevant in our time.