“ Although pig meat, idols, and the other things listed in the Mishna are all forbidden objects, they are that way because the Torah prohibited them, and not because of any voluntary human action. Therefore, it is impossible for hatfasah to work using these items. ”

“ Such a vow is obviously permitted, since it is impossible to transfer a prohibition from chullin, which is not prohibited. Because this particular point is so obvious, the Gemara will discuss why it is necessary for the Tanna to mention it.
" [That which I eat from yours shall become to me] like pig meat." " [...] like idols." " [...] like the flesh over the heart." (It was ancient pagan practice to carve out the flesh directly over the heart while the animal was still living, and to offer that flesh as a sacrifice to their gods.) " [...] like insects"; "like creeping creatures". ”