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Can kiddushin take effect at the beginning of biah or only at its completion? The Gemara (גמרא)'s conclusion that "kol ha'boeil daito l'gmar biah" means a person's intent is for the completed act, not retroactively from the start. This principle prevents kiddushin with biah for a kohen gadol and clarifies the Rambam (רמב"ם)'s distinction between erusin and nisuin.
The shiur analyzes the fundamental question in Kiddushin 10a: does the act of biah (marital relations) effect kiddushin from its beginning (techilat biah) or only upon its completion (sof biah)? The Gemara (גמרא)'s inquiry centers on whether the kinyan (acquisition) works retroactively from the initial contact or only when the act is complete. Rabbi Zweig examines the major Rishonim's approaches. The Rashba and Rivam hold that it depends on the person's kavanah (intent)—if he intends to be mekadesh at the beginning, techilat biah works; if at the end, sof biah. Rabbeinu Tam argues that the Gemara is addressing whether biah requires techilat hach'nasat ha'atar (initial penetration) or sof hach'nasat ha'atar (complete penetration), attempting to align this Gemara with the principle in Yevamot that "ha'arah konah" (initial contact effects acquisition).
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Kiddushin 10a
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