For neither they themselves who are circumcised keep the law; but desire to have you circumcised, that they may glory in your flesh.
All Commentaries on Galatians 6:13 Go To Galatians 6
Augustine of Hippo
AD 430
Not only did [the Judaizers] wish to avoid persecution from the Jews, who were absolutely unwilling to let the law be given to the uncircumcised, but they desired to boast to the Jews about the number of proselytes they made.