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The second perek of Massekhet Shevuot, Perek Yediot HaTumah, begins on our daf, and continues the discussion of issues of ritual defilement.
From the simple reading of the Torah (see Vayikra 5:2-3) it would seem that coming into physical contact with a dead creature that gives off ritual defilement is, itself prohibited. Nevertheless, the tradition of the Sages is that there is nothing inherently wrong with touching such a creature; the only prohibition is for someone who is ritually defiled through such contact to enter the Temple precincts or spread that tumah to something consecrated.
The first Mishna repeats the teaching that appeared at the beginning of Massekhet Shevuot (see 2a), that the laws of yediot ha-tumah – recognizing that someone was ritually defiled and then interacted with the Temple or some consecrated object – have the same “two that are four” pattern that parallel the case of shevuot – oaths – in that they contain two basic concepts that include four ideas. The two concepts that are written in the Torah are that –
We examine purity laws from a historical and cultural perspective.