'Circumcision' in the Bible

Be on the watch against dogs, against the workers of evil, against those of the circumcision:

For we are the circumcision, who give worship to God and have glory in Jesus Christ, and have no faith in the flesh:

Being given circumcision on the eighth day, of the nation of Israel, of the tribe of Benjamin, a Hebrew of Hebrews; in relation to the law, a Pharisee: