What is the status of an animal slaughtered to items connected to the ground, like mountains, seas, rivers or deserts? The Mishna rules that the shechita is invalid, but the assumption from the Mishna is that it is not prohibited for benefit. The Gemara challenges this from a braita which states that such slaughter renders the animal an idolatrous sacrifice (zivchei meitim), which is forbidden for benefit. Abaye resolves this by distinguishing between slaughtering to the item itself - which only disqualifies the shechita - and slaughtering to the angel or deity of the landmark (gadda), which renders it forbidden from any benefit.

Can a person render someone else's property forbidden by performing an act of idolatry with it? Rav Huna rules that if a friend's animal is lying before an idol and someone slaughters one siman for the idol, the animal becomes forbidden. He relies on the principle of Ulla that while merely bowing to another's animal does not forbid it, performing a physical action (ma'aseh) directly on the animal does forbid it.

A difficulty is raised against Rav Huna from a braita regarding one who slaughters a sin offering on Shabbat outside the Temple courtyard for an idol, who is held liable for three distinct sin offerings. If the animal becomes forbidden at the first siman, as per Rav Huna's position, the completion of the slaughter should not trigger the liability for slaughtering outside the Temple, as it would merely be slaughtering a disqualified animal that would no longer be considered a sacrifice. The Gemara offers two resolutions - applying the case to a bird sin offering where the slaughterer specifies that his intent for idol worship will only take effect upon the completion of the slaughter, or in the shechita of a bird sin offering where half the windpipe was already slit, and in this case the shechita was completed in one small action.

Rav Nachman, Rav Avram, and Rav Yitzchak disagree with Rav Huna and reaffirm the established principle that a person cannot forbid something that is not theirs (ein adam oser davar she'eino shelo) even by performing an action on the item. A difficulty is raised against this position from the braita quoted above with the interpretation given above.