Reference for Yevamot 5:7
ותנא אחותו ואחות אמו דקרובי עצמו ואיידי דאיירי באיסור אחוה תנא אחות אשתו ובדין הוא דליקדמה לכלתו מקמי אשת אחיו שלא היה בעולמו דלא משום קורבא הוא דאסירא אלא איידי דאיירי באיסור אחוה תנא אשת אחיו שלא היה בעולמו והדר תנא כלתו
and while dealing with prohibitions due to brotherhood he also mentions HIS WIFE'S SISTER. And it would indeed have been proper that HIS DAUGHTER-IN-LAW should be placed before THE WIFE OF HIS BROTHER WHO WAS NOT HIS CONTEMPORARY, since it is not on account of kinship<span class="x" onmousemove="('comment',' A daughter-in-law should, consequently, receive priority. ');"><sup>17</sup></span> that the latter is forbidden, but as he was dealing with a prohibition due to brotherhood he mentioned also THE WIFE OF HIS BROTHER WHO WAS NOT HIS CONTEMPORARY and then mentioned HIS DAUGHTER-IN-LAW. What argument can be advanced for using<span class="x" onmousemove="('comment',' In our Mishnah. ');"><sup>18</sup></span>
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