Thematic Bible: Necessity of, denied by paul

But although Titus, my companion, was a Greek, they did not compel even him to be circumcised. Yet there were false brethren who had crept in to spy out the freedom we enjoy in Christ Jesus, in order to enslave us again. To them we did not yield submission even for an hour, in order that the truth of the gospel might abide unshaken among you.