Reference for Yevamot 92:12
ר' יוסי אומר אין מטבילין פשיטא דכיון דאמר רבי יוסי תרתי בעינן תקוני גברא בשבת לא מתקנינן
'R. Jose, however, said: He is not to be allowed to perform the ablution'. Is not this obvious? Since R. Jose said that both<span class="x" onmousemove="('comment',' Circumcision and ablution, ');"><sup>33</sup></span> are required [ablution must be forbidden as] the improvement of a man<span class="x" onmousemove="('comment',' Which is completed by the ablution (v. supra p. 305, n. 6). ');"><sup>34</sup></span> may not be effected on the Sabbath! — It might have been assumed that in the opinion of R. Jose circumcision forms the principal [part of the initiation] and that the reason there<span class="x" onmousemove="('comment',' Supra. Where a proselyte who declared, 'I have been circumcised but have not performed ritual ablution' is not to be allowed ablution. ');"><sup>35</sup></span>