The dispute between the Rabbis and Rabbi Shimon on whether pouring of the oil of a meal offering requires a kohen is based on different ways of interpreting the verses in Vayikra 2:1-2. The Rabbis maintain that the requirement for a kohen is only mentioned from the act of scooping, or kemitza, allowing a non-kohen to handle the pouring and mixing of the oil. Rabbi Shimon, however, views the connective language in the verse as a link that binds the entire process together, necessitating a kohen for every stage. At first the Gemara suggested that Rabbi Shimon's reasoning was based on "a phrase can relate to both the upcoming and previous action," but after showing that in a different issue, Rabbi Shimon did not employ that principle, they explain the "vav"("and") connects the previous section to the kohen.

Rav explains that if the words torah and chukka appear in a verse, that signifies that a failure to perform a detail exactly as described invalidates the entire offering. Through a series of challenges involving the nazir, the metzora, and the service of Yom Kippur, the Gemara refines this: if either term is employed, it indicates it is an essential detail. However, after raising a difficulty from all sacrifices, Rav's statement is further refined: the term chukka is the primary indicator of indispensability, whereas torah on its own is not.

Repetition serves as another marker of necessity in the eyes of Rav, who argues that when the Torah returns to a subject multiple times, it is to emphasize that the detail is essential. This leads to a clash with Shmuel about whether or not is it essential that the scooping (kemitza) be performed by hand. Rav considers the method essential because it is repeated in the context of the Tabernacle's inauguration. Shmuel, however, holds that a one-time historical event is not a binding source for future generations.

A difficulty is raised against the principle of Rav that if something is repeated, it is indispensable, as the act of hagasha, bringing the mincha offering to the Altar, is repeated and yet is listed in the Mishna as not essential. The Gemara responds by explaining that the second mention is needed for a different purpose – to pinpoint the exact location on the Altar where the mincha offering is to be brought.