On that day R’ Akiva expounded: And any earthenware utensil into which any of them falls, whatever is in it shall become tamei (Lev. 11:33) —- it does not say “tamei,” but rather “yitma” —- [even] to render others tamei. This teaches that a loaf which is of a sheni [degree of tumah] can make a shlishi [degree of tumah]. R’ Yehoshua said: Who will remove the dust from your eyes, Rabban Yochanan ben Zakkai! —- for you used to say that a future generation would [pro- nounce] tahor a loaf that was [contaminated as] a shlishi, since there is no verse in the Torah that it is tamei. But [now] does not Akiva your disciple adduce a verse from the Torah that it is tamei, as it is said: Whatever is in it shall be tamei.