Reference for Shevuot 47:2
בשלמא לריש לקיש משום הכי קא פטר רבי שמעון דתניא רבי שמעון אומר כל שהוא למכות ולא אמרו כזית אלא לקרבן אלא לרבי יוחנן מאי טעמא דרבי שמעון דפטר
Granted, according to Resh Lakish, it is for this reason that R. Simeon exempts him; for we learnt, R. Simeon says: A minute quantity [imposes liability] for stripes; and it was not said that a ka-zayith is necessary except for [imposing liability for] a sacrifice. But, according to R. Johanan, what is R. Simon's reason for exempting him? - Is not the reason [that the Sages make him liable] because it is a more inclusive prohibition? R. Simeon is consistent in his view that a more inclusive prohibition cannot take effect; for it has been taught, R. Simeon Says: He who eats carrion on the Day of Atonement is exempt. Granted, according to Resh Lakish, it is possible to have it negative and positive; but, according to R. Johanan, granted that negative is possible, but how is positive possible? - Well then, [the Mishnah may be explained] in accordance with Raba's view, for Raba said: [If a man says,] 'I swear I shall not eat', and he ate dust, he is exempt. <br>