Whatsoever requires immersion in the waters [of a mikweh] by decree of the Scribes will [through contact] render consecrated food unclean, and terumah invalid, but will leave common food or Second Tithe unaffected: so R. Meir. The Sages however regard Second Tithe to be affected. R. Shimi b. Ashi demurred: Is it really so? Perhaps the Sages differ with R. Meir only on the question of eating this Second Tithe, but there is no dispute between them on the question of coming into contact with the Second Tithe or of eating common food! And here [in our Mishnah] it is a question of coming into contact, for it reads: AND MAY BE EATEN BY HIM WHOSE HANDS HAVE NOT BEEN WASHED, and this might very well mean that we are dealing with the case of one person feeding another? — Rather, said R. Papa, here [in the Mishnah] we are dealing with hands that were unclean in the first degree, and the ruling is in accordance with the view of R. Simeon b. Eleazar. For it was taught: Hands which are unclean in the first degree can in no wise affect common food. R. Simeon b. Eleazar says in the name of R. Meir, Hands which are unclean in the first degree can affect common food, and hands which are unclean in the second degree can affect terumah. Does this mean to say that hands which are unclean in the first degree can affect common food only and not terumah? — Indeed no; it means, hands which are unclean in the first degree can affect even common food, but hands which are unclean in the second degree can affect terumah only but not common food. But is it possible for hands to be unclean in the first degree? — Yes. For we have learnt: If a person put his hands into a house stricken with leprosy, his hands become unclean in the first degree: so R. Akiba. The Sages however say, His hands become unclean in the second degree. Now all accept the principle that an entry by part of the person only is no entry, and the dispute between them is the extent of uncleanness imposed by the Rabbis upon the hands as a precaution against the entry of the whole person. One [R. Akiba] says that the Rabbis imposed upon the hands the same degree of uncleanness as upon the person himself; but the Sages say that they imposed upon the hands the usual degree of uncleanness attached to hands. But why do we not say that the ruling [in our Mishnah] accords with R. Akiba, who also holds that hands can be unclean in the first degree? — Because it may be that R. Akiba says so only with regard to terumah or consecrated food, since these are to be treated with strictness, but with regard to common food [he would agree that] they are unclean only in the second degree. But even so, be they unclean only in the second degree, have we not learnt that according to R. Akiba, whatever is unclean in the second degree can render common food unclean in the third degree? For we have learnt: On that same day R. Akiba expounded: It is written: And every earthen vessel, [whereinto any of them falleth, whatsoever is in it] shall be unclean [yitma]. Now there is not written tame but yitma, which signifies that it will make others unclean. This teaches that a loaf which is unclean in the second degree will [by contact] render common food unclean in the third degree? — Perhaps this is the law only with regard to such uncleanness as declared by the Torah but not with regard to such uncleanness as decreed by the Rabbis. R. Eleazar said in the name of R. Hoshaia, Here [in our Mishnah] we are dealing with unconsecrated animals that were kept in the cleanness proper to consecrated things, and the ruling is not in accordance with R. Joshua's view. For we have learnt: R. Eliezer says. He who eats [food unclean in] the first [degree becomes unclean in the] first degree; [if it was unclean] in the second degree, [he becomes unclean in] the second degree; and [if it was unclean in] the third degree, [he becomes unclean in] the third degree. R. Joshua says, [He who eats food unclean in] the first or second degree [becomes unclean in] the second degree; [if it was unclean in] the third degree. [he becomes unclean in] the second degree with regard to consecrated things only, but not with regard to terumah. This applies only to common food kept in the cleanness proper to terumah. And so only in the case of common food kept in the cleanness proper to terumah [is there a third degree of uncleanness], but not in the case of common food kept in the cleanness proper to consecrated things, for he [R. Joshua] is of the opinion that in that latter case there cannot be a third degree of uncleanness. Why should we not say that our Mishnah dealsᵃᵇᶜᵈᵉᶠᵍʰⁱʲᵏˡᵐⁿᵒᵖᵠʳˢᵗᵘᵛʷˣʸᶻᵃᵃᵃᵇᵃᶜ