פירוש על עבודה זרה 53:4

The Talmud now reverses the opinions back to the first reversal. R. Judah now holds that a non-Jew may circumcise but a Samaritan may not. The R. Judah in the baraita that disallowed a non-Jew, was not the regular R. Judah [bar Ilai] but R. Judah the Prince.