ודלמא בוכרא דאמא הוא גמירי בוכרא דאבא מסי רוקיה בוכרא דאמא לא מסי רוקיה
[the son] did not renounce [his privileges].<span class="x" onmousemove="('comment',' Which the Torah had conferred upon him. Hence the law that the stipulation is null.
');"><sup>33</sup></span> R. Joseph said: [If] one said, 'X is my firstborn son', [the latter] is to receive a double portion.<span class="x" onmousemove="('comment',' His father's word is sufficient in this case to establish his right.
');"><sup>34</sup></span> [But if he said]. 'X is a firstborn' [the latter] is not to receive a double portion, for he may have meant,' the firstborn son of his mother'.<span class="x" onmousemove="('comment',' Such a firstborn has to be redeemed from the priest in the same way as the firstborn of a father, but is not entitled to a double portion.
');"><sup>35</sup></span>
Tosefta Kiddushin
"[Be betrothed to me] with the understanding that if I die you will not bound to a levir"—she is betrothed but his stipulation is invalid, for he stipulated against what was written in the Torah, and anyone who stipulates against what is written in the Torah, his stipulation is invalid. "With the understanding that I will have no responsibility for you for clothing or sex"—she is betrothed but his stipulation is invalid. This is the pneumonic: Anyone who stipulates against what is written in the Torah regarding a monetary matter—his stipulation stands; with a non-monetary matter—his stipulation is invalid.
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Tosefta Ketubot
Rabbi Yehudah says: [The husband] can always eat the fruits' fruit [i.e. the interest's interest, even if he said in the ketubah that he gives up access to the fruit from her property]. How so? He can sell the fruit and buy with [that money] land, and he can eat the fruit. Rabban Shimon ben Gamliel and Rabbi Yohanan ben Berokah say: If she dies, he inherits it [the fruit, even if he said he wouldn't have access to it in the ketubah], for she made a stipulation against what was written in the Torah and anyone who stipulates against what is written in the Torah, his stipulation is null and void.
