In the Torah verse regarding the purification of the leper (Vayikra 14:17 ), the word “right” appears three times - once in reference to the hand, once to the foot, and once to the ear. Rava explains that each mention teaches the requirement to use the right hand in a different ritual: one for kemitza (taking a handful of flour) in meal offerings, one for chalitza (the release ceremony of levirate marriage), and one for piercing the ear of a Jewish slave.

According to Rabba bar bar Hanna, quoting Rabbi Yochanan, wherever the Torah uses the term “kohen,” the action must be performed with the right hand. Based on this, Rava’s drasha regarding kemitza teaches that not only the taking of the kometz (handful) must be done with the right hand, but also its placement into the kli sharet (sanctified vessel).

Rabbi Shimon, who either does not require this part of the process or does not require it to be done with the right hand, agrees that the kemitza itself must be performed with the right hand, as derived from Vayikra 6:10 , which compares the meal offering to the sin offering. Therefore, Rava’s interpretation applies specifically to the meal offering of a sinner, brought as part of a sliding scale offering.

The Mishna rules that if the blood spills directly onto the floor from the animal, without first being collected in a sanctified vessel, the blood is disqualified.

A braita teaches that the blood to be collected must be the spurting blood from the act of slaughter - not blood from a cut, nor residual blood that flows after most of the blood has exited the animal. The blood must flow directly from the animal into the kli sharet, from which it will be sprinkled on the altar. These laws are derived from Vayikra 4:5, in the context of the sin offering of the Kohen Gadol.

Rav rules that all of the blood must be collected, based on Vayikra 4:7. According to Shmuel, the knife must be lifted immediately after slaughter to prevent blood from dripping off the knife into the vessel, since the blood must come directly from the animal. Rav Chisda and Rabbi Yochanan explain that the animal’s throat must be held directly over the vessel to ensure the blood flows straight into it.

Rabbi Asi posed a question to Rabbi Yochanan regarding the airspace above a vessel. The Gemara brings three versions of the question and Rabbi Yochanan’s response:

1. If the bottom of the vessel broke before the blood reached it, but the blood had already entered the vessel’s airspace, does this count as if the blood had reached the vessel? If so, the blood could be collected from the floor and used on the altar. To answer the question, Rabbi Yochanan cited a braita regarding a barrel into which fresh water streamed into its airspace, disqualifying it for use in the red heifer purification waters, as it is considered as though the water entered the vessel. However, this comparison is problematic, since the red heifer case does not involve a broken vessel. To justify the citation, the Gemara reframes the question as a two-pronged inquiry.
2. The question was about the barrel, and the answer was drawn from the aforementioned braita.
3. The question was about the barrel, and the answer was derived from the laws of sacrificial blood, which must reach the vessel directly. Since the blood passes through the airspace first, this implies that the airspace is treated as part of the vessel.

If the animal becomes blemished after slaughter but before the blood is collected, brought to the altar, or poured, the blood is disqualified. A source is cited from the laws of the sin offering to support this. The Gemara attempts to extend this ruling to offerings of lesser sanctity, such as the Paschal sacrifice, but the proof is ultimately rejected.