Galatians 2:4

2:4 Now this matter arose because of the false brothers with false pretenses who slipped in unnoticed to spy on our freedom that we have in Christ Jesus, to make us slaves.

Galatians 6:12

6:12 Those who want to make a good showing in external matters are trying to force you to be circumcised. They do so only to avoid being persecuted for the cross of Christ.