World Wide Study Bible
a Bible passage
13. Translate, "For not even do they who submit to circumcision, keep the law themselves (Ro 2:17-23), but they wish you (emphatical) to be circumcised," &c. They arbitrarily selected circumcision out of the whole law, as though observing it would stand instead of their non-observance of the rest of the law.
that they may glory in your flesh—namely, in the outward change (opposed to an inward change wrought by the Spirit) which they have effected in bringing you over to their own Jewish-Christian party.