Parah 10:1-2

What you need to know:

Midras = impurity conveyed by being sat on by a zav

Madaf = a rabbinically-imposed form of impurity intended as a safeguard.

Parah 10:1

Anything that is susceptible to midras impurity is considered to have madaf impurity vis-à-vis the sanctification water; this is so regardless of whether that thing is ritually clean or unclean. The same rule applies to humans. Regarding things that are susceptible to corpse impurity, whether they are ritually clean or unclean, Rabbi Eliezer says they don’t have madaf impurity but Rabbi Yehoshua says that they do. The Sages say that something ritually unclean has madaf impurity and something ritually clean doesn’t.

Parah 10:2

If a person who was clean for the sanctification water touches something with madaf impurity, he is rendered unclean. If a flask that was designated for the sanctification water touches something with madaf impurity, it is rendered unclean. If a person who was clean for the sanctification water touches food or liquids with his hand, he is rendered unclean but if he does so with his foot, he remains clean. If he moves them with his hand, Rabbi Yehoshua says that he is rendered unclean but the Sages say that he remains clean.