“I swear that I will not eat,” and he ate foods that are unfit to eat or drank beverages that are unfit to drink —- he is exempt. “I swear that I will not eat,” and he ate neveilos, treifos, abominable creatures, or crawling things —- he is liable. R' Shimon exempts [him].  [If] he said, “Konam that my wife derive pleasure from me if I have eaten today,” and he had eaten neveilos, treifos, abominable creatures, or crawling things —- his wife is forbidden.

[The law applies] both to matters pertaining to himself as well as to matters pertaining to others; and to both matters of substance and matters lacking substance. How so? [If] he said, “I swear that I will give to so-and-so,” or “that I will not give”; [or] “that I gave,” or “that I did not give”; “that I will sleep,” or “that I will not sleep”; “that I slept,” or “that I did not sleep”; “that I will cast a pebble into the sea,” or “that I will not cast”; [or] “that I have cast,” or “that I have not cast.” R' Yish-mael says: He is liable only for [oaths concerning] the future. As it states (Lev. 5:4): To do bad or to do good. Said R' Akiva to him: If so, we know only of things pertaining to doing bad or good; [but] how do we know of things not pertaining to doing bad or good? He said to him: From the extension of the verse. He said to him: If the verse extended it in that regard, the verse extended it in this regard [as well].