Pesachim 73: Constructing and Uprooting

Who's Who: Rabbi Tarfon, and his unusual take on terumah. Also, one who violates Shabbat without that action including some constructive aspect, that violation is not complete, for the sake of "melekhet machshevet." According to those who say that one who injures another, the injury is incomplete in this way (and the perpetrator is exempt from a korban chatat), whyever would a Korban Pesach that is brought in ways that disqualify it on Shabbat incur a korban chatat? Indeed, the Gemara goes on to look for constructive aspects to each case of a disqualified Korban Pesach to account of the chatat. Plus: what happens to the disqualified Korban Pesach? Can it be redirected to be a korban shelamim? And if so, does it require a conscious uprooting (akira) to shift its identity? And if it does, what are the implications for the korban?