Reference for Shevuot 3:7
שְׁבוּעָה שֶׁלֹּא אֹכַל כִּכָּר זוֹ, שְׁבוּעָה שֶׁלֹּא אֹכֲלֶנָּה, שְׁבוּעָה שֶׁלֹּא אֹכֲלֶנָּה, וַאֲכָלָהּ, אֵינוֹ חַיָּב אֶלָּא אַחַת. זוֹ הִיא שְׁבוּעַת בִּטּוּי, שֶׁחַיָּבִין עַל זְדוֹנָהּ מַכּוֹת וְעַל שִׁגְגָתָהּ קָרְבָּן עוֹלֶה וְיוֹרֵד. שְׁבוּעַת שָׁוְא, חַיָּבִין עַל זְדוֹנָהּ מַכּוֹת וְעַל שִׁגְגָתָהּ פָּטוּר:
"I swear that I shall not eat this loaf. I swear that I shall not eat it. I swear that I shall not eat it," and he ate it, he is liable only for one. [The reason that he is liable only for one is that the (second) oath does not "take" on the first. But if he first said: "I shall not eat it," and then: "I shall not eat," and he ate the whole thing, he is liable for two. For when he says: "I shall not eat it," he is not liable until he eats the whole thing, and when he then says: "I shall not eat," once he eats an olive-size of it, he is liable. Therefore, the second oath takes, and he is liable when he eats an olive-size of it. And when he then eats the whole thing, he is liable by reason of the first oath. ("I swear that I shall not eat it. I swear that I shall not eat it":) Even though the second oath, "I shall not eat it," is enough to apprise us that one oath does not "take" on the other, the third is still taught to apprise us that even though there is no liability for the latter oaths, they are nonetheless oaths, and not vain words, and if they can "find a place," they take effect. For if a sage absolves him of the first, the second takes effect and it is forbidden to him by reason of the second oath. Likewise, if he is absolved of the first two, the third takes effect. For the sage uproots the vow completely, so that it is as if he had never vowed, and the second "takes" retroactively, the first being regarded as non-existent once he has been absolved of it.] This is an oath of pronouncement, where for willful transgression one is liable to stripes, and for unwitting transgression, to an oleh veyored offering. With a vain oath, for willful transgression one is liable to stripes, and for unwitting transgression, he is not liable.
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