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Much of the Temple service involves collecting parts of sacrifices in a keli sharet – a special Temple vessel – an act that sanctifies that part of the offering and prepares it for its intended use as part of the service.
What if the kohen performed the service, but neglected to sanctify the offering in a keli sharet?
The Mishna on our daf rules that if the kometz – the fistful of flour removed by the kohen from the meal offering for sacrifice on the altar – was not placed in a keli sharet, it is invalid. Rabbi Shimon disagrees, ruling that it remains valid nevertheless.
Rashi explains that according to all opinions, the original meal offering must be brought in a keli sharet in order to sanctify it in the first place. The disagreement focuses only on the second stage, when the kometz is taken from the meal offering, when it is placed in another keli sharet to be sanctified for placement on the altar. Nevertheless, from the Rambam’s Commentary to the Mishna it appears that he views the disagreement even in the first stage of preparation.