A.T. Robertson Commentary Galatians 6:13

"For not even they who receive circumcision do themselves keep the law; but they desire to have you circumcised, that they may glory in your flesh." — Galatians 6:13 (ASV)

They who receive circumcision (ο περιτεμνομενο). Present causative middle of περιτεμνω, those who are having themselves circumcised. Some MSS. read ο περιτετμημενο), "they who have been circumcised" (perfect passive participle). Probably the present (περιτεμνομενο) is correct as the harder reading.