Tohoros 6:4-5

Tohoros 6:4

However many doubts and exponential doubts about doubts, those cases of doubt in a private domain are ruled unclean and those in the public domain are ruled clean, as follows: if a person entered an alley and there was a ritually-unclean object in the courtyard, and a doubt arose as to whether or not he entered the courtyard; if a ritually-unclean object was in a house and a doubt arose as to whether or not he entered; if he entered and a doubt arose as to whether or not the impurity was there; if it was there and a doubt arose as to whether or not it was of the requisite size to convey impurity; if it was the requisite size and a doubt arose as to whether it was unclean or clean; if it was unclean and a doubt arose as to whether or not or not he touched it. Any such case of doubt is ruled unclean. Rabbi Elazar says that a doubt as to whether or not he entered is ruled clean but a doubt as to whether or not he touched it is ruled unclean.

Tohoros 6:5

Let’s say that someone entered a valley in the rainy season and there was impurity in a certain field. If the person says that he went to that place but he doesn’t know whether or not he entered that field, Rabbi Elazar rules him clean and the Sages rule him unclean.