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The verse repeats the word "v'Ne'elam" when it discusses Yedi'os ha'Tum'ah. The verse first says, "v'Ne'elam v'Hu Tamei" (Vayikra 5:2), and then it says again, "v'Ne'elam v'Hu Yada" (5:3). Rebbi Akiva and Rebbi disagree about the intention of the verse.
RASHI explains their disagreement as follows: Rebbi Akiva learns from the first word of "v'Ne'elam" that one is liable only for He'elem Tum'ah but not for He'elem Mikdash. He derives from the second phrase, "v'Ne'elam v'Hu Yada," that there was a Yedi'ah that preceded the Ha'alamah, because the phrase "v'Hu Yada" should be read before the second "v'Ne'elam" and after the first, which implies that he forgot after he first knew.
We continue our exploration of the editing of the Mishnah.