Galatians 2:14
But when I saw that they walked not uprightly according to the truth of the gospel, I said unto Peter before them all, If thou, being a Jew, livest after the manner of Gentiles, and not as do the Jews, why compellest thou the Gentiles to live as do the Jews?
Galatians 5:11
And I, brethren, if I yet preach circumcision, why do I yet suffer persecution? then is the offence of the cross ceased.