1. A person who slaughters a Korban Pesach when he still has Chametz in his possession transgresses a Lo Sa'aseh.
2. Rebbi Shimon: One is liable for slaughtering a Korban Pesach on Erev Pesach when he has Chametz in his possession only when he performs the Shechitah with proper intent.
3. Rebbi Shimon discusses when one is not liable for slaughtering a Korban when he has Chametz in his possession during Pesach.
4. There is a dispute about where the Chametz must be in order to transgress this prohibition (#1).
5. A person who swears that he will eat a loaf today and does not do so is exempt from Malkus.
A BIT MORE
1. Rebbi Yehudah maintains that even a person who slaughters the afternoon Korban Tamid of Erev Pesach when he has Chametz in his possession transgresses a Lo Sa'aseh.
2. However, if he slaughters it with intent that it should be another Korban, or he slaughters another type of Korban on Erev Pesach afternoon with Chametz in his possession, he is exempt.
3. Generally, one is liable unless he slaughters a Korban Pesach on Pesach (not on Erev Pesach) with intent that it should be a Korban Pesach, since such a Korban is invalid.
4. Reish Lakish: The Chametz must be with him in the Azarah. Rebbi Yochanan: He transgresses the prohibition even if the Chametz is not with him in the Azarah.
5. Rebbi Yochanan: This is because he performed no action, and therefore he does not receive Malkus for transgressing his oath. Reish Lakish: This is because it was not possible for witnesses to give him a definite warning during that day not to transgress, since he might still eat the loaf at some point before the end of the day.