Commentary for Kiddushin 100:14
גופא אמר רבה כל שאינו בזה אחר זה אפי' בבת אחת אינו איתיביה אביי
but if kiddushin with her is not valid, is he then liable to kareth?<span class="x" onmousemove="('comment',' V, Glos. in fact, he is not married to either, and so may take the sister.');"><sup>26</sup></span> But, said Raba, the verse refers to consecutive [marriage],<span class="x" onmousemove="('comment',' Lit., 'this after this'.');"><sup>27</sup></span> and our Mishnah is in accordance with Rabbah, who said: That which cannot be [done] consecutively cannot be [done] simultaneously. The text [stated]: 'Rabbah said: That which cannot be [done] consecutively cannot be done simultaneously.' Abaye raised an objection against him:
Daf Shevui to Kiddushin
If one gives 2/10 of one’s produce as tithe, the produce is considered tithed and may be eaten. But the tithes themselves are ruined since we do not know which part is the tithe and which part is not. But why, Abaye asks, is the second tenth considered even potentially a tithe? If I can’t first separate 1/10 and then another 1/10 both as tithes (indeed, one cannot), then when both are separated at the same time, neither of them should be tithes? This seems to refute Rabbah.
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