The chavitin of the Kohen Gadol are kneaded, shaped, and baked within [the Courtyard]; and they override the Sabbath. Their grinding and sifting do not override the Sabbath. R’ Akiva stated a rule: Any labor which can be done prior to the Sabbath does not override the Sabbath; whereas one which cannot be done prior to the Sabbath overrides the Sabbath.