Reference for Yevamot 110:3

אלא יבמה ליבם מנלן אתיא ביאה ביאה

if [one follows] him who holds that it<span class="x" onmousemove="('comment',' The marriage with a stranger before halizah had been performed. ');">⁷</span> is a positive precept,<span class="x" onmousemove="('comment',' From Deut. XXV, 5, it follows that the levir shall marry her (positive); hence no other (negative); and a negative precept derived from a positive one has the force of the positive. ');">⁸</span> [it would be subject to the same restrictions as any other] positive precept.<span class="x" onmousemove="('comment',' And, as has been shewn supra, the first stage is included in the restrictions. ');">⁶</span>

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