This week's learning is sponsored by Dvora Lopez in loving memory of her mother on her 51st yahrzeit. "She had great strength and abundant love."

This week's learning is sponsored by the Futornick family in honor of Shira's 21st birthday.

This week's learning is sponsored by Yisroel and Masha Rotman, for a refuah shleima, a complete and speedy recovery, for Elisheva Mindel bat Masha Tzivia.

The Mishna appears to contradict itself regarding general oaths about eating. It implies that a general oath "not to eat" would not include foods that cannot be eaten (which would encompass non-kosher food), yet another case in the Mishna rules that someone who makes a general oath "not to eat" does include non-kosher food in that prohibition. Two different resolutions are offered. The first resolution distinguishes between someone who made a general oath ("I will not eat") and someone who made a specific oath ("I will not eat regular and non-kosher foods"). The sages provide two different interpretations for why an oath that specifically mentions both non-kosher and kosher foods would be effective. Difficulties are raised against both positions, and one remains unresolved. The second interpretation explains that the previous implication from the Mishna is incorrect—"foods that cannot be eaten" refers to truly inedible items and does not include non-kosher foods, which are technically edible. The final case in the Mishna is cited as proof for this position but is ultimately rejected.

What distinguishes issur kollel from issur mosif? Issur kollel occurs when a second prohibition encompasses additional prohibited items, while issur mosif occurs when a second prohibition adds further restrictions to the same item or extends the prohibition to additional people. Based on this distinction, Rava explains why someone who accepts that issur mosif applies would not necessarily accept the same for issur kollel. Since issur mosif relates to a single item—adding a prohibition to the item itself or prohibiting the item to more people, it can apply. However, when additional items are included in the prohibition, it will not necessarily apply to what was already forbidden.

Rava further explains that just as issur kollel takes effect, the same principle applies to an oath that includes other items. He needed to specify this because one might have assumed it only applies to prohibitions that arise independently, not to oaths where a person creates the prohibition.

Rava the son of Raba raises a challenge to Rava's statement based on a Mishna in Kreitut, which suggests that an oath adding additional prohibitions would not apply to what was already forbidden. Six different explanations are offered to resolve this contradiction.