Today's daf is sponsored by the Pittsburgh daf yomi group for a refuah shleima for Rabbi Amy Bardack, haRav Ahuva bat Liba who is having surgery today. "Wishing our organizer and leader a speedy recovery."
In support of Rabbi Yochanan's ruling that leftover animals designated for communal offerings can be redeemed at the end of the year, Raba brings an example of incense which has inherent sanctity and can be redeemed at the end of the year. Rav Chisda disagrees with Raba as he holds that incense does not have inherent sanctity until a later stage when it is brought into a sanctified vessel just before being offered on the altar. Raba proves his position that it has inherent sanctity.
The Gemara then returns to Rav Chisda's original question of how can one redeem items with inherent sanctity. Raba answers that the court stipulates at the beginning of the year that any animals not needed will be only sanctified for their value. Abaye raises a difficulty from other communal offerings that cannot be redeemed if lost and replaced and then found. However, Raba answers that the stipulation is for typical, not atypical cases. Why, then, can the red heifer be redeemed in certain circumstances? The Gemara concludes that a stipulation is made because of its high value.
Abaye raises a further difficulty from our Mishna, as Rabbi Shimon answers a question about whether animals designated for one sacrifice that are leftover can be used for another with a particular answer instead of answering that the court stipulated such, as Raba would have said. Raba answers that Rabbi Shimon doesn't agree with the rabbis that the court can stipulate. Rabbi Yochanan and Raba's approach is based only on the rabbis' position.