TT #682 · Parashas Ki Seitzei · Seventh Aliyah · Passuk 25:05
When brothers dwell together and one of them dies and has no son, the wife of the dead shall not be outside to a strange man; her husband’s brother shall come upon her and take her to himself as a wife and perform the duty of a husband’s brother for her.
Torah Temimah points to Kiddushin 14a.
TT lemma: וְיִבְּמָהּ.
יָכוֹל כְּשֵׁם שֶׁבִּיאָה גּוֹמֶרֶת בָּהּ כָּךְ יִהְיוּ כֶּסֶף וְשְׁטָר גּוֹמְרִים בָּהּ? תַּלְמוּד לוֹמַר יְבָמָהּ יָבֹא עָלֶיהָ וְיִבְּמָהּ – מְלַמֵּד שֶׁבִּיאָה גּוֹמֶרֶת בָּהּ וְאֵין כֶּסֶף וְשְׁטָר גּוֹמְרִים בָּהּ.
English: Might one think that just as bi’ah completes the acquisition, so money and document complete it? Scripture says “her yavam shall come upon her and perform the duty of a husband’s brother” — teaching that bi’ah completes it and money and document do not.
On the daf / in context: On the biblical level only bi’ah acquires the yevamah; rabbinically money or document create a partial prohibition to the other brothers.
Derash excluding money and document as biblical modes of acquisition.
Biblically, only intercourse completes the acquisition of the yevamah; money and document do not.