Halakhah for Yevamot 168:14
אי הכי יש לו אח כשר נמי כשר לקהל מכלל דהוא פסול לקהל אלא לאו כהן ומדהוא כהן היא כהנת מידי איריא הא כדאיתא והא כדאיתא
That case<span class="x" onmousemove="('comment',' Of a halal who married a woman of legitimate status. ');"><sup>27</sup></span> was required [for the specific purpose] of informing us [that the law is] in agreement with [the ruling] Rab Judah reported in the name of Rab. For Rab Judah reported in the name of Rab: Women of legitimate [priestly] status were not forbidden to be married to men of tainted birth.<span class="x" onmousemove="('comment',' Kid. 731, 76a, infra 85a. The purpose of our Mishnah in giving the law of the halal was not to teach the prohibition of the woman to the levir (which, of course, as pointed out supra, was unnecessary) but her permission to marry a husband though he is a halal and she is of legitimate status or of pure priestly stock. The prohibition to marry one of impure stock is incumbent upon the man and not upon the woman. ');"><sup>28</sup></span>