Aliba deRashi: Beit Shammai permits the kisuy lehatechila with deker nautz or even without?
As for my iyun, i could not find no proof for neither options.
Joseph Kayeri, Sao Paulo
1) Rav Ovadyah of Bartenura writes, in his commentary on the Mishnah, that according to Beis Shamai, the Beis Din tells him that he can slaughter l'Chatchilah only if he has prepared a Deker Na'utz before Yom Tov. The Tosfos Yom Tov adds that the Deker Na'utz is required because otherwise he would have to do "Ketishah," crush up the earth, which is forbidden on Shabbos and Yom Tov because it is a form of "Techinah," grinding.
2) The source of the Bartenura and the Tosfos Yom Tov is the last Rashi on Daf 7b (DH v'Ha Ka). One learns from Rashi that if he did not already have a Deker Na'utz there would be a Torah prohibition involved in digging the earth, so both Beis Shamai and Beis Hillel agree that one may not slaughter without a Deker Na'utz.
Joseph, we're wishing you a very Happy Chanukah, which will give us all much light for the whole of the year!