Halakhah for Shevuot 54:7
<big><strong>מתני׳</strong></big> שבועה שלא אוכל ככר זו שבועה שלא אוכלנה שבועה שלא אוכלנה ואכלה אינו חייב אלא אחת
Raba said: If he swore concerning a loaf, and was eating it; then, if he left a ka-zayith of it, he may obtain absolution from it; but if he has eaten it all, he cannot obtain absolution from it. Said R. Aha the son of Raba to R. Ashi: How is this? If he said, I shall not eat,' then from the first ka-zayith he has already transgressed the prohibition? And if he said: I shall not eat it', then why mention ka-zayith,
Sefer HaChinukh
And [it] is practiced in every place and at all times by males and females. And one who transgresses it and swears that a pillar of marble is of gold; or of gold that it is of gold; or to negate this commandment; or to do something that is not in the power of a man to do it is lashed, when volitional. And even though there is no act, the Torah made him liable for lashes due to the severity of the matter (Shevuot 27b). And he is exempted from a sacrifice for this, when inadvertent. But with a false oath - and that is what is called an oath of expression - the Torah obligated a sacrifice for inadvertence, as we shall write (Sefer HaChinukh 123) with God's help.
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