Commentary for Kiddushin 101:11
תנן המקדש אשה ובתה או אשה ואחותה כאחת אינן מקודשות הא אחת מאשה ובתה או מאשה ואחותה מקודשת ואמאי קידושין שאין מסורין לביאה נינהו תיובתא דרבא
Raba said: Bar Ahina explained it to me: When a man taketh a woman and has intercourse with her;<span class="x" onmousemove="('comment',' Deut. XXIV, 1.');"><sup>18</sup></span> [this teaches:] kiddushin<span class="x" onmousemove="('comment',' Implied by, when a man taketh, i.e., betroths.');"><sup>19</sup></span>
Daf Shevui to Kiddushin
The mishnah is used as a difficulty against Rava. A man cannot betroth both a woman and her sister, daughter or mother. But if he says to a woman and her mother/sister/daughter, “One of the two of you is betrothed to me” by deduction it would seem that they all could be doubtfully betrothed even though sex with any of them would be prohibited. This seems to be a refutation of Rava.
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