Today's daf is sponsored by Elana Kermaier in loving memory of her father, Moishe Fox, Moshe Yehuda ben Harav Binyamin and Chaya Tzipora, on his seventh yahrzeit. "I miss his smile, his chuckle, his humor, and his warmth more and more as the years go by."

If the kohen does not stand directly on the floor but rather on an object placed upon the floor while performing one of the central sacrificial rites, this is considered a chatzitza—an interposition—and disqualifies the sacrifice. From where is this derived?

The Mishna presents three examples of such interpositions between the kohen and the floor. Each example is necessary to illustrate different types of chatzitzot.

A braita is cited with Rabbi Eliezer's ruling: if a kohen has one foot on the ground and the other on an object, and the object is removed such that he can stand solely on the grounded foot, the sacrifice remains valid.

Rabbi Ami raises a question regarding a kohen standing on a loose stone. One version of his inquiry concerns whether the looseness of the stone constitutes a chatzitza. An alternative version explores whether, if the stone were removed and the kohen stood directly on the ground beneath, the rite would be valid.

The Mishna also discusses a debate between the Rabbis and Rabbi Shimon regarding whether accepting the blood with the left hand renders the sacrifice invalid. Their disagreement centers on the interpretation of the verse in Vayikra 4:25. Three explanations are offered by Rav Yehuda, Rava, and Abaye to clarify the root of the dispute. Abaye further notes a third interpretation by Rabbi Elazar, son of Rabbi Shimon, who holds that while the blood must be accepted with the right hand, the sprinkling may be performed with the left.

Rabba bar bar Channa quotes Rabbi Yochanan, who teaches that if the Torah mentions both "kohen" and "finger," the action must be performed with the right hand. Rava clarifies that Rabbi Yochanan meant that even if either term appears independently, the right hand is required. Abaye limits this principle to essential sacrificial rites. The Gemara explains that Rabbi Shimon requires the right hand if either "finger" appears alone or "kohen" together with "finger".

According to Rabbi Yochanan's rule that the mention of "kohen" implies the use of the right hand, why did Rava derive a gezera shava—a textual analogy—from the three mentions of "right" in the leper purification ritual (right hand, right foot, right ear), applying one of them to kemitza (the flour offering), when the verse already includes the word "kohen"? This is there to teach an additional halakha that requires the right hand.