Commentary for Yevamot 9:7

ואכתי איצטריך סד"א שאני כהנים הואיל וריבה בהן הכתוב מצות יתירות אפילו לאו שאין שוה בכל לא דחי קמ"ל דדחי

hence it was explicitly stated, 'his beard'.<span class="x" onmousemove="('comment',' Indicating that in the case of a leprous priest the precept of shaving supersedes the prohibition of 'shaving'. ');">¹⁷</span> And since there is no object in applying it to a prohibition which is not incumbent upon everybody,<span class="x" onmousemove="('comment',' That such a prohibition is superseded by a positive precept having been deduced supra from 'his head'. ');">¹⁸</span> let it be applied to a prohibition which is incumbent upon all.<span class="x" onmousemove="('comment',' Thus it has been proved that a positive precept supersedes any prohibition even if the latter is generally applicable. Marriage between a levir and his deceased brother's widow who is his wife's sister might, consequently, have been assumed to be permitted had not an explicit text pointed to its prohibition. ');">¹⁹</span>

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