If the wall stood upon ground that belonged to him and to the house of idolatry, the area is calculated as half and half as far as moving into his property before rebuilding the wall, and one may build the wall four cubits from the middle of the wall. Its stones and its wood and its dust from the house of idolatry transmit impurity like creeping animals, and by rabbinic decree, one who touches them becomes impure like one who touches a creeping animal, as it is stated: “And you shall not bring an abomination into your house and become banned like it, you shall utterly detest it [shaketz teshaketzenu] and you shall utterly abhor it, for it is a banned object” (Deuteronomy 7:26). Shaketz is a term used with regard to creeping animals. Rabbi Akiva says: Idolatry transmits impurity like a menstruating woman, as it is stated: “You will cast them away as you would a menstruating woman [dava]” (Isaiah 30:22). Just as a menstruating woman transmits impurity imparted by carrying, as one who moves a menstruating woman without touching her becomes impure, so too, idolatry transmits impurity imparted by carrying. Rabba said in explanation of that which the verse said: “You will cast them away”: Make them foreign to you like a stranger. The end of the same verse: “You will tell it, get out” means that under no circumstances can you say to it, come in.

And to the essence of the dispute, Rabba said: With regard to impurity imparted by carrying, everyone agrees that idol worship transmits impurity, as it is juxtaposed to a menstruating woman in the verse. Where they argue, it is with regard to the halakha of a very heavy stone. There is a special law with regard to the ritual impurity of a zav and a menstruating woman. If they sit on an object, even if it is an object that cannot become ritually impure, and beneath that object is a vessel, even though the weight of the zav and the menstruating woman has no effect on the vessel, it becomes ritually impure. Rabbi Akiva holds that the impurity of idolatry is like the impurity of a menstruating woman in all respects; just as a menstruating woman transmits impurity via a very heavy stone, so too, idolatry transmits impurity via a very heavy stone. And the Rabbis hold that in this regard, the impurity of idolatry is like the impurity of a creeping animal; just as a creeping animal does not transmit impurity via a very heavy stone, so too, idolatry does not transmit impurity via a very heavy stone.

The Gemara asks: And according to Rabbi Akiva, who holds that the impurity of idolatry is similar to that of a menstruating woman in all respects, for what halakha was it juxtaposed to a creeping animal? The Gemara explains: In his opinion, it was not stated in reference to idolatry itself, but rather to its accessories, objects used for the purposes of idolatry. The Gemara asks further: And according to the Rabbis, for what halakha was it juxtaposed to a menstruating woman? To teach that it transmits impurity through carrying. And instead of juxtaposing idolatry to both a menstruating woman and to creeping animals, let the Torah juxtapose it to an animal carcass, which transmits impurity through carrying and does not transmit impurity via a very heavy stone, since according to the Rabbis the law is the same for idolatry. The Gemara answers: Yes, it is indeed so. In that sense, juxtaposition to an animal carcass would suffice. However, the juxtaposition to a menstruating woman teaches: Just as a menstruating woman does not transmit impurity through limbs, as if the limb of a menstruating woman is supported by a vessel, the vessel does not become ritually impure (Ra’avad), so too, idolatry does not transmit impurity through limbs, as a severed part of an idol does not transmit impurity. The Gemara is puzzled by this: But that which Rav Ḥama bar Guria raised as a dilemma: Does idolatry have the capacity to transmit impurity through limbs or does it not have the capacity to transmit impurity through limbs? Resolve the dilemma from this, as according to the opinion of the Rabbis, it does not transmit impurity through limbs. And the Gemara replies: Although that is so, Rav Ḥama bar Guria raised the dilemma in accordance with the opinion of Rabbi Akiva and the dilemma is unresolved.

And in another approach to this dispute, Rabbi Elazar said: With regard to a very heavy stone, everyone agrees that idolatry does not transmit impurity in that manner. Where they disagree is with regard to impurity imparted by carrying. Rabbi Akiva holds that the legal status of idolatry is like that of a menstruating woman: Just as a menstruating woman transmits impurity through carrying, so too, idolatry transmits impurity through carrying. And the Rabbis hold that the legal status of idolatry is like that of a creeping animal: Just as a creeping animal does not transmit impurity through carrying, so too, idolatry does not transmit impurity through carrying. The Gemara asks: And according to Rabbi Akiva’s opinion, with regard to what halakha was idolatry juxtaposed to a creeping animal? The Gemara answers: With regard to the halakha that its accessories do not transmit impurity through carrying. The Gemara asks: And according to the Rabbis, with regard to what halakha was idolatry juxtaposed to a menstruating woman? The Gemara answers: Just as a menstruating woman does not transmit impurity through her limbs, so too, idolatry does not transmit impurity through its limbs.