Reference for Sanhedrin 37:2

גזירה ביאה ראשונה אטו ביאה שניה

The positive command<span class="x" onmousemove="('comment',' Of yibbum. — This is a general rule, where two precepts come into opposition. ');">³</span> should set aside the negative? — The first act of connubial intercourse was forbidden as a preventive measure against further acts.<span class="x" onmousemove="('comment',' Which would be a transgression, the precept having been fulfilled by the first. ');">⁴</span>

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