Ravina adds an additional method to derive that a worker is permitted to eat while working with detached produce and that it is prohibited to muzzle an ox even from attached produce. Four tannaitic sources are cited that derive details of the laws regarding the employer allowing a worker to eat from the produce. Each source derives a different detail from the word "thresh" in the verse about the ox - that it refers to items that grow from the ground, at a stage that the produce is ready to be picked and until the stage that it is obligated in tithing or separating challa. A question is asked whether one can toast grains or produce to sweeten them. Is this considered like eating grapes with another substance, which is not permitted, or not? Four sources are cited to address this question, but each is rejected as inconclusive, and the question remains unanswered. The last source states that one may not add salt to fruit, but this contradicts another source that permits it. Abaye and Rava each reconcile the contradiction differently, but both understand the salt issue to be relating to the obligation to tithe and not to what is permitted/not permitted for a worker to eat.