Commentary for Kiddushin 102:9
מי לא עסקינן דאמרה ליה קידושי לדידך אפ"ה לא שביק איניש מצוה דרמיא עליה ועביד מצוה דלא רמיא עליה
But do we not refer [even] to where she said to him, 'Let my kiddushin be yours!' - Even so, a man does not leave undone an obligation [sc. marrying his daughter] which falls [primarily] upon himself,<span class="x" onmousemove="('comment',' Sc. the betrothal of his minor daughter.');"><sup>12</sup></span> to perform one which does not.<span class="x" onmousemove="('comment',' A bogereth can see to herself.');"><sup>13</sup></span>
Daf Shevui to Kiddushin
Even if the adult daughter told the father he could keep the kiddushin money, we still assume he married off the younger daughter because he has a mitzvah to marry her off. There is no mitzvah to marry off the older daughter.
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