Reference for Yevamot 103:4

גופא אמר רב הונא מצות יבמין מקדש ואחר כך בועל ואם בעל ועשה מאמר קנה אם בעל ועשה מאמר פשיטא דהא קניה בביאה אלא אימא אם בעל בלא מאמר קנה

hence we were taught [that he does]. [To turn to] the main text. 'R. Huna said: The precept of marriage with a sister-in-law is properly performed when the levir first betroths and then cohabits with her. If he cohabited with her, and then addressed to her a ma'amar a <i>kinyan</i> is nevertheless constituted.' 'If he cohabited with her and then addressed to her a ma'amar is so obvious,<span class="x" onmousemove="('comment',' That a kinyan had been effected. ');">¹⁰</span> since he had acquired her by the cohabitation!<span class="x" onmousemove="('comment',' What need then was there to state the obvious? ');">¹¹</span>

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